Knee injury continues to 'bother' Rafael Nadal

Rafael Nadal admitted his knee injury continues to "bother" him after the Spaniard suffered double defeat in the final of the singles and doubles tournaments at the VTR Open in Vina del Mar, Chile.

The clay court event was the former world No. 1's first tournament in seven months due to an injury to his left knee, which caused him to miss both the U.S. Open as well as the Australian Open.

"The knee is still bothering me, but you have to face adversity with the best possible face and look forward to keep working and enjoy what I like the most, to play tennis," said the 11-time grand slam champion told the ATP World Tour's website.

Despite his discomfort and a 6-7 (2-7) 7-6 (8-6) 6-4 loss to Argentina's Horacio Zeballos, Nadal stressed the positives he had taken away from the event having played nine matches in six days.

"A week ago we didn't know how the body would respond," the 26-year-old Mallorcan. "[Now] at least I know we can compete at a certain level."I think that was a positive week... I will try to keep improving my physical sensations day-by-day, which is the most important thing because I don't feel that my tennis level is bad. I need more time on court.

World No. 43 Zeballos picked up his first career Tour title and became just the third player to beat Nadal in a clay court final, following in the foot steps of Roger Federer and Novak Djokovic.

It was only Nadal's fifth defeat in 41 clay court finals.

"The tennis is important, but for me the best thing was to have the feelings I've had this week, with a full stadium and one of the best crowds I've ever had in my life," added Nadal. "It's a place I won't forget because of the love people gave me.

"I was two points away from winning the title, but I said from first day that the result was not the most important thing, although I would've liked to win.

"My opponent won, he deserved it and I congratulate him. Still, to win four matches in a row is good news for me."

Nadal and Argentine partner Juan Monaco lost the doubles final to Italians Potito Starace and Paolo Lorenzi.

This week Nadal will continue his rehabilitation in South America, where he will be top seed at this week's Brazil Open in Sao Paulo.

See the worst service in the tennis history

Na Li - Agnieszka Radwanska

Chinese Na Li is won the Australian Open quarter-finals match, in this match he served the worst service in history.

In a match against Agnieszka Radwanska, during the his service, Na Li sent ball to the stands, and earned standing ovations.

Worst serve in the tennis history you can se in the video below.

Williams & Stephens set for all-American showdown

As a child, Sloane Stephens decorated her bedroom walls with pictures of the Williams sisters. Later this week, the 19-year-old will play third seed Serena Williams in her first grand slam quarterfinal at the Australian Open.

Stephens, seeded 29th, battled hard on Monday to see off the challenge of Serbia's Bojana Jovanovski 6-1 3-6 7-5 and set up a last eight tie with 15-time grand slam winner Williams.

The pair played each other in the recent Brisbane International event, with Williams emerging with a 6-4 6-3 triumph."You've just got to go and treat it like another match," Stephens told a post-match press conference. "It wasn't like, 'Oh, my God, I played Serena, I'm going to be so great at all these other things because she just taught me so much.'

"It was just another match, regular match. Little things that you just take and move on. That was two weeks ago now, three weeks ago ... I played seven other matches or eight other matches, so I'm kind of past what happened then.

"But I think definitely just treat it as another match. You just go out and do your best."

Williams continued her imperious run of form with a 6-2 6-0 defeat of Russia's No. 14 Maria Kirilenko. The 31-year-old is aiming to secure a sixth success at the Melbourne grand slam.

World No. 1 Victoria Azarenka could face Williams in the semifinals. The defending champion eased into the last eight with a straight-forward 6-1 6-1 win against Russian Elena Vesnina.

"I was focused and in control from the beginning," said Belarus' Azarenka. "That was important for me. I feel like I'm improving from match to match. I just want to keep going the same way."

Next up for Azarenka is another Russian in the shape of Svetlana Kuznetsova, who got the better of former world No. 1 Caroline Wozniacki. Denmark's Wozniacki is still searching for the first grand slam title of her career.

"You obviously don't feel great when you lose, so I think that's pretty obvious," explained 10th seed Wozniacki. "But it was a close game. I had my chances and I didn't take them. I could have won but I didn't.

"I'm encouraged about the way I played and the way I came out of some situations and the way I was playing the points. Obviously I would have loved to have won today, but it didn't happen."

Djokovic pushed to the limit by Stanislas Wawrinka

Novak Djokovic

 Novak Djokovic is still in this Australian Open, but he needed all his fighting spirit to overcome the inspired challenge of the No15 Stanislas Wawrinka to get out of the fourth round in a struggle that straddled midnight and lasted just over five hours.

The last dog-fight Djokovic had on this court he overcame Rafael Nadal in nearly six hours to win his third title here in probably the most brutal final in the history of grand slam tennis. A year later, back in the Rod Laver Arena, he was drawn into a quicker five-set struggle of slightly lesser quality but comparable intensity.

Of the 26-five-setters so far in the 2013 tournament, this was the most absorbing, the first on the main show court and one that could have a significant impact on the eventual result.

The Serb won 1-6, 7-5, 6-4, 6-7 (5), 12-10, not as even as his recent performances – after four hours, he had hit 54 unforced errors, four more than in his previous three matches combined – but he fashioned a remarkable fightback and, at the end, just got the better of a gripping conclusion.

"It's hard to find the words," Djokovic said. "He deserved, equally, to be a winner of this match. I give him a lot of credit and respect. He was the aggressive player on the court, I was just trying to hang in there. It's midway through the tournament but it feels like a final to me. This means a lot to me, and to him. Incredible that so many people stayed until nearly two in the morning. It brings back the memories of 12 months ago with Rafa."

Those left in the draw will still be wary of the world No1, of course, because he is always dangerous when wounded, but they might sense vulnerability that was not there before. Pinned deep by the weight of Wawrinka's shots all night, he struggled to consistently dictate the pattern of the exchanges, despite the excellence of his defensive game.

Playing in new shoes, he slipped at the start, but stood tall at the end. Had Wawrinka won either he, Tomas Berdych, David Ferrer or Nicolas Almagro, who meet in the other quarter-final in this section of the draw, would have made the final, only the second "intruder" from outside the Big Four in 34 majors. As it is, the status quo remains.

What a beast Djokovic is. Not many players could have let Wawrinka bludgeon his way to a 6-1, 5-2 lead before clawing his way back to parity and victory.

He out-gutted one of the game's quiet men, a solid citizen who looked to have frozen in sight of the prize before again and again coming back at the No1 seed. His next opponent, Tomas Berdych, also is prone to attacks of self-doubt in good company – although he came through a long, third-set tie-break to beat Kevin Anderson in the Margaret Court Arena earlier in the day, and, if he is at his best, he will give the Serb another serious argument.

For nearly an hour, it was impossible to recognise Djokovic as the shirt-ripping, chest-beating force of nature who traded nuclear missiles with Nadal in the same place a year ago. This was an inferior model, albeit a formidable one.

Stan was the man for the first five games, breaking for a second time with a disguised one-handed backhand he might have borrowed from his compatriot Roger Federer. Djokovic could not find rhythm on his serve or any steadiness in his ground strokes. He breathed heavily, sweat bathing his brow.

Everything was going Wawrinka's way, gloriously so as he sent a sizzling forehand around the net post, then served out to love to go 5-1 before they had properly warmed up, and took the set with an unreachable forehand whipped across a stationary, bamboozled Djokovic.

Wawrinka was in serving heaven, belting them down at around 211kph at a strike rate of 72% in the first set, 64% overall. His 2012 average was 56%.

Djokovic lifted himself immediately, needing just one of two break points to hit back at the start of the second, but, no sooner had he come to life, than he drifted out of focus again and buried a backhand low into the net to drop serve for the fourth time in a row. He trailed 1-4 after less than an hour, and his bad night had turned into a nightmare. His own game was collapsing while Wawrinka went through long stretches where nearly everything he tried came off, comfortable in the knowledge that he was playing a ghost.

Djokovic pulled one back in the sixth game and got a firmer foothold in the match to drag himself back to 3-5. The ghost left the building; the animal growled again.

The prospect of blowing a 6-1, 4-1 lead, and being in touching of a two-set lead at 30-0 and 5-2 up in the second, seemed, for a while, to suffocate his tennis. Serving for the set, he lost the energy in his shot-making and Djokovic pounced to break back and level.

It was now an exercise in redemption for Djokovic, while Wawrinka had to cope with the disappointment of wasting a chance he might never have again in his career.

Djokovic was hitting deeper, and so was Wawrinka – except his ground strokes were continuously straying long. There was hardly a soul in the house who did not make the champion a firm favourite. When he broke at the start of the third, he celebrated with a leap and a yell that curdled the blood. It was the frightening Djokovic of 12 months ago.

Wawrinka looked shattered but he was not entirely done, visibly relieved when Djokovic punched a backhand long, to give him another look. The tension hung heavy in the night air, as neither could establish dominance but, Djokovic broke then held to go a set up after two hours and 10 minutes.

Wawrinka had court-side treatment to his right thigh, but was hitting hard enough in the 10th game of the fourth set to knock a letter off the sponsor's name on the net, and his spirits rose as he urged the crowd to lift the volume after holding to love for 6-5. What the fans did was boo officials whose warped priority was to hold up play while they re-attached the sponsor's sign.

Back on planet reality, Wawrinka went 3-0 up in the tie-break as they went past midnight, and held three set points at 6-3; after clipping the net in mid-rally, he took the match into a fifth set at 6-5 with a firm forehand, no less than he deserved.

Having played so heroically to retrieve the advantage he threw away at the start, Wawrinka broke at the first time of asking in the fifth but was again struck down by his groin strain and dropped serve after a deuce duel.

It was impossible to gauge who might win, as neither had played with total conviction from the front, while both produced some of their most inspired tennis from behind.

Djokovic saved break point with a pressure smash and stayed ahead on serve with a cross-court forehand that recalled some of his best work.

In the sixth game, Wawrinka cramped up but held to level. At 4-4, he "blew" four break points, the last one on a wrong call with no challenges left. It was the most wretched turn of events for an underdog who refused to lie down.

From that point, neither flinched until Wawrinka served only his second double fault of the match and hit long for deuce in the 22nd game, after nearly five hours of tennis. Djokovic got to match point three times, and brought the drama to a fitting close with a forehand that passed an exhausted Wawrinka at the net. Their embrace at the net was one of the deepest respect. And, yes, Djokovic, saw fit to rip that shirt off again.

Murray wins first round in Australian Open

Andy Murray

Appearances can be deceiving but mostly they are not. A lightly grilled audience in the Rod Laver Arena witnessed the evidence of that when the grooved and muscled tennis machine that is Andy Murray methodically deconstructed his opponent, Robin Haase, a slim and ambitious contender from the old school, to advance to the second round of the Australian Open.

They were born within a month of each other, in 1987, and each stands at 6ft 3in, armed with enough talent to win any rally, but not, in the Dutchman's case, necessarily any match. Murray outweighs Haase by a stone, all of it pure power, and that is one reason the Scot resides on a different part of Planet Tennis: in many of his matches he is a lion among lambs.

He arrived in Australia fresh from a prolonged winter training camp in Florida; Haase, who does not have those resources, turned up having won only one of his past 10 matches.

After an hour and 37 minutes the world No3 had crushed the world No53 6-3, 6-1, 6-3. It was an entertaining workout, with plenty of lovely shots on both sides of the net, the concluding ones invariably delivered by Murray.

"It was a good start," Murray said. "Nice to win in straight sets. It took a little while to get used to the breeze. I've come close here a few times, so to finally get a slam [in New York] was great and I'll try to focus on the second part of my career now."

Asked about what seems to be an ideal relationship with his coach of 12 months, Ivan Lendl, Murray joked, "Yeah, in front of the cameras, anyway. He works me very hard. He's very honest, very open."

Haase, with a whipping one-handed backhand and equal facility to crunch topspin winners on the other wing, was as pleasing on the eye as Murray was physically imposing, his double-fisted ground strokes full of mechanical menace.

Haase's recent results constitute a poor return for a clearly talented player who does not seem to have tamed his urge to play big points all the time. It is fine to trust your talent, more important to know how much you have – especially if your opponent is soaking it up and giving it back with interest. That is a dividing line on the tour: those who get desperate and those who get the job done. Memories of his fighting five-set loss to Murray at the 2011 US Open were just that on this Tuesday in Melbourne.

It was the perfunctory that took first blood over the ambitious, as Murray (who had just missed a miracle running forehand around the post) forced the Dutchman to hit long at the end of a brief rally in the third game.

Hitting flat through a light breeze inside this blue cavern, he was getting more purchase on his shots as Haase continued to search for the killer shot with bags of overspin and drift. If he had watched Murray handle the howling gales of Flushing Meadows last summer he might have taken a different tack, so to speak. This was more a teasing shudder of occasional wind than a hurricane, but it never the less required management.

Trailing 4-1, Haase lifted his game appreciably. Murray had to save four break points, the first with a carefully modulated pressure rally, followed by two sublime aces, one up the middle, then wide on the backhand side, before grinding his opponent into errors in his old-fashioned way to lead 5-1 after 27 minutes.

Murray lost focus with the set in his pocket and, after Haase held, the US Open champion double-faulted and handed him hope with a shot from the baseline that dropped softly into the net for 5-3, before serving out in 41 minutes.

It was a little longer than he might have wished 20 minutes earlier, workmanlike rather than dazzling tennis, which one could gauge from the polite rather than raucous applause that greeted each winner.

The first crack in the second set came in the fourth game when Murray drew Haase to the net and there seized on his inability to handle spin-laden shots from mid-court that all but kissed the cord. Haase shook his curly locks in frustration as volley after volley billowed the net.

Murray was coasting on the hour, a set and 4-1 up, master of his own destiny, destroyer of Haase's. There were shards of magic from the Dutchman, but his forearm weakened in sync with his spirit and Murray's march to victory was unstoppable. The Haase curls shook after nearly every exchange now, like a teenager who realised he had wandered into a conversation with grown-ups.

He continued to fight, however, trusting that talent, hoping for something unlikely to unfold, knowing it probably would not. In the third and concluding session Murray put him up against the ropes and worked him over all the way to the final bell.

Britain's other representative in the men's singles, Jamie Baker, could not build on his run through qualifying as he fell to Lukas Rosol, the Czech who found fame last year by beating Rafael Nadal at Wimbledon. The Glaswegian served for the first two sets but could not get the job done in a 7-6 (7-5), 7-5, 6-2 defeat as Rosol's all-or-nothing game clicked at the vital moments.

"The way he plays you just try to stick with him, don't let him get a lead and get confident," Baker said. "I executed it perfectly until those two games when I didn't take my chances. I was playing the right way but it's difficult to analyse that particular match in that he doesn't play like anyone else on tour.

"He's like a freak show. He doesn't put the ball in court the whole set but he continues doing the same thing. Any sane person would change tactics but he doesn't and then sure enough it happens at some point. It's very difficult to get any control."