Federer’s latest win gave him 43 career victories at Key Biscayne, one more than Pete Sampras and second in men’s history only to Andre Agassi’s 61.

Andy Murray won on Sunday while Ivan Lendl watched as a fan rather than a coach.

With Lendl among the stadium spectators, Murray advanced to the fourth round at the Sony Open by beating Feliciano Lopez 6-4, 6-1.

“We’re back together again. It was only a four- or five-day split,” Murray joked. “No, it’s a shame he won’t be watching many more of my matches from the stands.”

Roger Federer also advanced easily, beating qualifier Thiemo de Bakker 6-3, 6-3. Venus Williams committed 44 unforced errors but had 11 aces and edged wild-card Casey Dellacqua 6-4, 5-7, 6-4.

Lendl helped Murray win Wimbledon, the U.S. Open, an Olympic gold medal and last year’s Key Biscayne title. Lendl said he decided to step down because he wanted to concentrate on other projects, among them playing more senior events.

Murray was unhappy about the split and said Lendl will be difficult to replace. Before their partnership, Murray was 0-4 in Grand Slam finals although he did win Key Biscayne in 2009.

The No. 6-seeded Murray moved one round closer to a potential quarterfinal against Novak Djokovic. Murray returned well and made the most of his chances at the net to improve to 9-0 against Lopez, seeded 32nd.

The victory came on a sunny, 85-degree Fahrenheit (29 Celsius) afternoon and Murray confirmed it was hot.

Murray’s next opponent will be No. 11-seeded Jo-Wilfried Tsonga, who outlasted Marcos Baghdatis 4-6, 7-6 (6), 7-5. Tsonga rallied from a 5-1 deficit in the tiebreaker.

Federer didn’t face a break point against de Bakker, and after two matches, he has lost only 10 points in 20 service games. Federer said a new racket he’s using gives him more power, especially on his first serve.

Williams, a three-time champion seeded No. 29, has won 54 matches on the island. She considers the tournament her home event, because she lives an hour away in Palm Beach Gardens.

Williams’ next opponent will be Australian Open finalist Dominika Cibulkova, the 10th seed, who beat No. 22 Alice Cornet 7-6 (6), 6-1.

China’s Li Na overcame three set points to overtake American Madison Keys 7-6 (3), 6-3. The No. 2-seeded Li, the reigning Australian Open champion, won even though she had seven double-faults and was broken four times.

No. 11 Caroline Wozniacki lost only five points in the second set and beat No. 17 Sloane Stephens 6-1, 6-0 with fiancş Rory McIlroy watching in the stands.

Monday’s schedule includes six-time champion Serena Williams against fellow American CoCo Vandeweghe, who rallied past Samantha Stosur 5-7, 7-5, 7-5 in a match that ended at 2-29 a.m. on Sunday.

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