The Latest from Wimbledon (all times local):

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9:45 p.m.

Centre Court at Wimbledon was evacuated Wednesday night because of a fire alarm after play had finished for the day.

It was not immediately clear whether there actually was a fire, but emergency vehicles arrived at the All England Club shortly after the alarm went off. Club spokesman Johnny Perkins said he didn't have any information on the cause of the alarm.

A public address announcement told everyone in or near the stadium to leave the area.

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8:50 p.m.

Venus Williams joined her younger sister in the third round at Wimbledon.

The Williams sisters have each won the title at the All England Club five times, but Venus hasn't won it since 2008.

Venus advanced Wednesday by beating Yulia Putintseva 7-6 (5), 6-4. Another win for each sister and they would meet in the fourth round.

The sisters have played each other 25 times, with Serena winning 14 of them.

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7:55 p.m.

Two down, five to go.

Serena Williams won again at Wimbledon on Wednesday, advancing to the third round as she tries to win a calendar-year Grand Slam.

Williams beat Timea Babos 6-4, 6-1 on Centre Court. The 20-time major champion has already won the Australian Open and the French Open this year. If she can win the last two majors, she would become the first player to win a true Grand Slam since Steffi Graf in 1988.

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7:20 p.m.

French Open champion Stan Wawrinka is through to the third round of Wimbledon.

The fourth-seeded Swiss beat Victor Estrella Burgos of the Dominican Republic 6-3, 6-4, 7-5 Wednesday.

Wawrinka has never been past the quarterfinals at the All England Club, reaching that stage last year.

The two-time major champion is looking to become the fifth man in the Open era to win both the French Open and Wimbledon in the same year. Two of the four that have managed that feat are playing at Wimbledon, Roger Federer and Rafael Nadal.

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7:15 p.m.

Bethanie Mattek-Sands eliminated seventh-seeded Ana Ivanovic in the second round at Wimbledon.

Mattek-Sands, who has only reached the third round once before, beat the 2008 French Open champion 6-3, 6-4 on Court No. 3.

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5:30 p.m.

It's the hottest day on record at Wimbledon, according to the Met Office.

Britain's official weather service said temperatures reached 35.7 degrees C (96.26 degrees F) on Wednesday at Kew Gardens, the closest observation site to the All England Club.

The previous record was 34.6 C (94.28 F) in the summer of 1976.

The Met Office also said it was "the hottest July day on record" in London, with 36.7 C (98.06 F) recorded at Heathrow Airport.

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4:55 p.m.

A ball boy collapsed in the heat during a match at Wimbledon on Wednesday and needed to be taken off the court on a stretcher.

With temperatures soaring, the boy needed treatment after collapsing on Court 17 during a match between Matthew Ebden and John Isner.

Wimbledon organizers tweeted later: "The Ball Boy from Court 17 has been treated and is feeling much better. We wish him a speedy recovery."

Isner won the second-round match 6-2, 7-6 (8), 6-4.

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4:35 p.m.

John Isner is back in Wimbledon's third round for the second consecutive year.

He's never been further.

The 17th-seeded American, best known for winning an 11-hour, 5-minute match over three days at the All England Club in 2010, defeated 148th-ranked wild-card entry Matthew Ebden of Australia 6-2, 7-6 (8), 6-4 on Wednesday, with the help of 23 aces.

Another U.S. man in action Wednesday, Steve Johnson, bowed out with a straight-set loss to 11th-seeded Grigor Dimitrov of Bulgaria.

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3:55 p.m.

Even for an Australian, the heat at Wimbledon on Wednesday was difficult to deal with.

Bernard Tomic said he was "dizzy" for a while in the second set of his victory over Pierre-Hugues Herbert of France in the second round.

With temperatures hovering around 34 degrees C (93 degrees F), it's one of the hottest days on record at Wimbledon. Tomic was able to recover for a 7-6 (3), 6-4, 7-6 (5) victory, but said the heat wave in London has been causing him problems all week.

"I just haven't been sleeping well here. It's been too hot," Tomic said. "I was fatigued and starting to get dizzy out there with the heat hitting me."

Tomic will need a good night's sleep before his next match — against defending champion Novak Djokovic.

The Serb beat Tomic in the quarterfinals in 2011, the Australian's best result at Wimbledon so far.

"Against him, you have to go out with a different mindset and different belief," Tomic said. "I have to serve very well to have any chance of winning."

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3:45 p.m.

One of the young guns in men's tennis knocked out one of the game's veterans.

Seventh-seeded Milos Raonic defeated Tommy Haas 6-0, 6-2, 6-7 (5), 7-6 (4) Wednesday on Court No. 1 to advance to the third round.

The 24-year-old Raonic reached the semifinals at the All England Club last year and is considered to be one of the top young players in tennis.

Haas, who is 37, on Monday became the oldest man to win a match at Wimbledon since Jimmy Connors in 1991.

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3:20 p.m.

Maria Sharapova made her way into the third round at Wimbledon, two years after losing at the same stage.

The fourth-seeded Sharapova beat Dutch qualifier Richel Hogenkamp 6-3, 6-1 on Court No. 2 on Wednesday, improving her record in second-round Grand Slam matches to 41-4.

In 2013, Sharapova lost to Michelle Larcher De Brito in the second round. Last year, the Russian lost in the fourth round at Wimbledon.

Sharapova won the first of her five major titles at Wimbledon in 2004. She has been back in the final at the All England Club only once since then, losing to Petra Kvitova in 2011.

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2:42 p.m.

Novak Djokovic got into trouble during his second round match at Wimbledon — for about five minutes.

The top-seeded defending champion was broken in the opening game of the match on Centre Court, but he quickly recovered and went on to a 6-4, 6-2, 6-3 win over Jarkko Nieminen of Finland.

Djokovic is a two-time champion at the All England Club, winning in 2011 and 2014. Last year, he beat seven-time champion Roger Federer in the final.

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1:20 p.m.

CoCo Vandeweghe eliminated 11th-seeded Karolina Pliskova of the Czech Republic 7-6 (5), 6-4 in the second round at Wimbledon on Wednesday.

The 23-year-old American will next face 22nd-seeded Sam Stosur, the 2011 U.S. Open champion. Vandeweghe beat Stosur in the second round of this year's Australian Open.

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12:55 p.m.

Kei Nishikori has withdrawn from Wimbledon because of a left calf injury.

The fifth-seeded Japanese player, who reached last year's U.S. Open final, was scheduled to play his second match on Centre Court on Wednesday. Nishikori beat Simone Bolelli in five sets in his opening match on Monday.

Nishikori reached the quarterfinals at both the Australian Open and the French Open this year.

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11:55 a.m.

Wimbledon will join in on the national minute's silence on Friday for the victims in the Tunisia shooting.

More than 20 Britons are confirmed to have died in last Friday's attack in the north African resort of Sousse.

The All England Club says play will start Friday at 12:15 p.m. on the outside courts, 45 minutes later than usual. The minute's silence will be held at noon.

All England Club chief executive Richard Lewis says "we will be asking all those in the grounds at the time to observe the silence out of respect to the victims in Tunisia and their families."

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11:45 a.m.

The umbrellas will be out at Wimbledon on Wednesday, as protection from the sun.

The All England Club normally readies itself for rain delays, but so far this year it's been about the heat. Wednesday's temperatures could reach 35 degrees C (95 degrees F), a number rarely seen in southwest London.

"I can't remember it being this hot at Wimbledon," said Tracy Austin, a former top-ranked player who twice reached the semifinals at the All England Club and who now works for the BBC as a commentator.

The temperature during Andy Murray's first-round victory on Tuesday was said to have reached 41 degrees C (106 degrees F) on court. But outside the stadium, the temperature stayed near the 30 degree C (86 degree F) mark.