First Rafael Nadal took a tumble into the net. Then he began complaining to the umpire. Then he bumped his opponent, Lukas Rosol, during a changeover.

Rosol thought the contact was intentional.

"I was surprised he could do it on the Centre Court at Wimbledon," Rosol said.

Karlovic accuses line judges of favouring Murray

Ivo Karlovic accused the line judges at Wimbledon of favouring Andy Murray after they called a number of foot-faults against the hard-serving Croat on Centre Court.

Karlovic, who lost, said some of the calls were "outrageous" and that "after this match, the whole credibility of this tournament went down for me."

Murray beat Karlovic 7-5, 6-7 (5), 6-2, 7-6 (4) Thursday to reach the third round, with the Croat being called for foot-faults on key points.

Karlovic said "it was always when it was 30-all or in a tiebreak. I mean, what is this? Is it Davis Cup or is it Wimbledon?"

Murray said he wasn't sure whether the calls were correct but that "if he wasn't foot-faulting then he has a right to be upset, because there was a lot of them."

Later on Twitter, Karlovic said: "Anyone who knows me can confirm that I'm not a sore looser (sic). But this is too much. 10 foot faults? Cmon. I never do foot faults."

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But the obscure Czech was not to be rattled. Nadal made his earliest Grand Slam exit since 2005, losing in the second round Thursday, 6-7 (9), 6-4, 6-4, 2-6, 6-4.

"In the fifth set he played more than unbelievable," Nadal said. "Before, first three sets, I didn't play well."

Nadal's demeanour grew glum as the match progressed, and in the third set, he bumped into Rosol as they crossed to reach their chairs for a break.

"He wanted to take my concentration," Rosol said. "That's OK. I knew he would try something, but I was concentrating."

The 26-year-old Rosol remained focused to the finish, earning the biggest win of his career while playing in Wimbledon's main draw for the first time. He lost each of the past five years in the first round of qualifying.

At No. 100, Rosol is the lowest-ranked player to beat Nadal in a Grand Slam tournament.

As the match stretched beyond dusk, the conclusion came with the retractable roof closed for the final set on Centre Court. The upset on tennis' biggest stage was no fluke: Rosol served brilliantly and repeatedly stepped instead the baseline to hit aggressive groundstrokes, while Nadal found himself pinned deep and on the defensive.

Among those shocked by the result was Rosol.

"I'm not just surprised; it's like a miracle for me," he said. "I never expected something like this."

Nadal saved three set points to win the opening set, but his mood soon became cross. Chasing a drop shot in the second set, he stumbled into the net as his racket went flying to the sideline, and he rose frowning at the slick grass.

After falling behind in the third set, he grumbled to the chair umpire during a changeover, apparently irritated by Rosol's movements as he awaited serves.

Following the match, Nadal declined to say what had him annoyed.

"Anything that I will say now will sound against me," he said. "It's not the right moment for me to say what happened out there, because it's going to sound like an excuse."

Said Rosol: "I was concentrating on myself. I don't know what he was complaining about."

Rosol exhaled before hitting his final shot, which was his 22nd ace, then fell to his knees with his arms up and collapsed face down on the famous grass. He then rose and shook hands at the net with a frowning Nadal.

"I think I was better today a little bit," Rosol said.

The 6-foot-5, 178-pound Czech lost only 16 points on his first serve, cracked his returns into the corners and won 22 of 28 points at the net.

In short, it was a complete performance that had spectators wondering why they'd never heard of him before. Nadal lost despite committing only 16 unforced errors in 276 points.

The Spaniard had reached the final in the past five Grand Slam tournaments, and had played in the final of his past five Wimbledons.

The 26-year-old Rosol earned the biggest win of his career playing in Wimbledon's main draw for the first time. He lost each of the past five years in the first round of qualifying.

As the match stretched beyond dusk, the conclusion came with the retractable roof closed for the final set on Centre Court. The upset on tennis' biggest stage was no fluke: Rosol served brilliantly and repeatedly stepped instead the baseline to hit aggressive groundstrokes, while Nadal found himself pinned deep and on the defensive.

Among those shocked by the result was Rosol.

"I'm not just surprised; it's like a miracle for me," he said. "I never expected something like this."

Nadal saved three set points to win the opening set, but his demeanour grew glum as Rosol overtook him. After falling behind in the third set, Nadal grumbled to the chair umpire during a changeover, apparently irritated by Rosol's movements as he awaited serves.

"I was concentrating on myself," Rosol said. "I don't know what he was complaining about."

Two games later, Nadal bumped into Rosol — and didn't acknowledge the contact — as they walked to their chairs for a break.

Rosol exhaled before hitting his final shot, which was his 22nd ace. He fell to his knees, arms up, then collapsed face down on the famous grass. He then rose and shook hands at the net with a frowning Nadal.

"I think I was better today a little bit," Rosol said.

Rosol became the lowest-ranked player to defeat Nadal in a major tournament. The 6-foot-5, 178-pound Czech lost only 16 points on his first serve, cracked his returns into the corners and won 22 of 28 points at the net.

In short, it was a complete performance that had spectators wondering why they'd never heard of him before. Nadal lost despite committing only 16 unforced errors in 276 points.

The Spaniard had reached the final in the past five Grand Slam tournaments, and had played in the final of his past five Wimbledons.

Sharapova, Serena potential final

Nadal won a record seventh French Open championship this month and was bidding for his third title at Wimbledon, where he was runner-up last year to Novak Djokovic.

Maria Sharapova's old serving problems resurfaced, costing her the second set before she recovered to beat dangerous Tsvetana Pironkova, 7-6 (3), 6-7 (3), 6-0. The Court 1 match took two days and ended three minutes after Williams concluded her victory on Centre Court, beating qualifier Melinda Czink 6-1, 6-4.

The No. 1-ranked Sharapova saved five set points in the first set and led the second set 3-1 when play was halted Wednesday because of darkness. She lost the first two games when the match resumed, and double-faulted on her first three service points in the tiebreaker.

"It felt like two matches in a way," Sharapova said. "Today I wanted to start off really well because I knew I was up a break. Didn't go according to plan. Really served sloppy."

Sharapova underwent shoulder surgery in 2008 and has been prone to double-faults, but in the final set she had no trouble with her serve — or anything else. She won 21 of the last 27 points and finished with just 11 unforced errors.

Sharapova said she didn't make any major changes down the stretch.

"We were playing with the same balls; I played with the same racket," she said. "I just started doing things a little bit better."

Pironkova, ranked 38th, beat Venus Williams at Wimbledon each of the past two years,

"If she played on grass 365 days a year, she'd be top five probably," Sharapova said. "She has the perfect game for it."

But Sharapova's at her best in winner-take-all sets. She improved her record in three-set matches to 9-0 this year and 21-1 since the beginning of 2011.

She has won 14 consecutive matches, including the French Open this month to complete a career Grand Slam.

While Sharapova battled an erratic serve, with eight aces and 10 double-faults, four-time champion Serena Williams had no such trouble. She won 27 of 28 points on her first serve, including 10 aces, and never faced a break point. Czink twice whiffed on returns.

"I love my serve," Williams said, "and I love feeling good when I serve."

The sixth-seeded Williams could meet Sharapova in the final next week. A 17-year-old Sharapova defeated Williams for the Wimbledon title in 2004.

On the verge of victory, Maria Sharapova briefly lost her bearings.

Sharapova's old serving problems resurfaced Thursday, costing her the second set before she recovered to beat dangerous Tsvetana Pironkova, 7-6 (3), 6-7 (3), 6-0.

The Court 1 match took two days and ended three minutes after Serena Williams concluded her second-round victory on Centre Court, beating qualifier Melinda Czink 6-1, 6-4.

It was a good day for Americans — Andy Roddick, Mardy Fish and No. 126-ranked Brian Baker also advanced, as did No. 28-seeded Christina McHale and Varvara Lepchenko.

Roddick advanced to the third round at a Grand Slam tournament for the first time in 2012 when he beat Bjorn Phau 6-3, 7-6 (1), 6-3. Roddick is seeded only 30th and fended off questions in recent months about retirement before he won his fifth grass-court title last week as a wild card at Eastbourne.

"The good patches and the bad patches are all between the ears," Roddick said. "I'm still enjoying myself on the tennis courts, so it's not for anybody else to say whether I can or can't play."

Fish, seeded 10th, needed more than four hours to beat British wild card James Ward, 6-3, 5-7, 6-4, 6-7 (3), 6-3. Fish is playing in his first tournament since undergoing a medical procedure in May for an accelerated heartbeat.

Baker, a qualifier whose career was derailed for 6 1/2 years by injuries, is into the third round at a Grand Slam tournament for the first time. He beat Jarkko Nieminen 6-0, 6-2, 6-4.

"I was definitely not expecting to get through so easily," Baker said.

The 20-year-old McHale advanced to the third round at her fourth consecutive Grand Slam tournament when she beat Mathilde Johansson 7-5, 7-5. McHale next plays No. 8-seeded Kerber with a chance to reach the fourth round at a major for the first time.

"I am still not finding my best tennis consistently over the two matches I have played," McHale said. "I still feel I can be a lot more offensive."

Lepchenko, ranked 53rd, advanced to the third round at Wimbledon for the first time by beating No. 31 Anastasia Pavlyuchenkova 7-6 (4), 6-4.

No. 2-seeded Victoria Azarenka defeated Romina Oprandi 6-2, 6-0.

British hopeful Andy Murray faced only one break point and beat big-serving Ivo Karlovic 7-5, 6-7 (5), 6-2, 7-6 (4). Kei Nishikori became the first Japanese man in 17 years to reach the third round at Wimbledon by beating Florent Serra 6-3, 7-5, 6-2.

Sara Errani committed only five unforced errors and beat Anne Keothavong of Britain 6-1, 6-1. The 25-year-old Errani, an Italian who has blossomed in Grand Slam competition this year, matched her best Wimbledon showing by advancing to the third round.

She was the French Open runner-up this month to Sharapova, and she's 12-2 in major tournaments in 2012. She began this year with a career record of 15-17 at majors.

Playing the day's first match on Court 2, the 10th-seeded Errani erased all three break points she faced and won in 61 minutes. That was a grueling effort compared with Wednesday, when she played only one point to complete a victory suspended overnight because of rain.

No. 7 David Ferrer defeated Kenny de Schepper 7-6 (1), 6-2, 6-4 and will next play Roddick. No. 13 Gilles Simon, who stirred debate this week when he said men should be paid more than women at tennis tournaments, lost to Xavier Malisse 6-4, 6-4, 7-6 (5).

Kerber beat Ekaterina Makarova 7-5, 6-3 while No. 9 Marion Bartoli, the runner-up in 2007, lost to Mirjana Lucic 6-4, 6-3.