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Roger Federer, Rafael Nadal and Serena Williams all moved on at Indian Wells on Tuesday, while Maria Sharapova was upset by defending champion Flavia Pennetta.

March 18, 2015

INDIAN WELLS, Calif. (AP) — Struggling with her serve and a rash of errors, Serena Williams overcame a slow start to beat Sloane Stephens 6-7 (3), 6-2, 6-2 in the fourth round at the BNP Paribas Open on Tuesday, extending her winning streak to 14 matches.

Maria Sharapova struggled mightily, too, losing 3-6, 6-3, 6-2 to defending champion Flavia Pennetta, who won her ninth straight match after becoming emotional and leaving the court in the first set.

Four-time Indian Wells champion Roger Federer defeated Andreas Seppi 6-3, 6-4, avenging his third-round loss to Seppi at the Australian Open.

Seppi fought off three match points on his serve to trail 5-4 in the third set. He netted a forehand to give Federer a fourth match point in the next game, and the Swiss star closed it out with a forehand winner in the corner.

Seppi's win Down Under stopped a 10-match skid against Federer. The Italian broke Federer to tie it up 3-all in the second, but Federer broke back on a forehand winner in the next game to take a lead he never gave up.

Pennetta went off and cried, saying she "let everything out, screaming, do something."

"For the first two or three games I was OK," Pennetta said. "Then it's coming. Like I never expect. I never do something like that. Normally you go away and you don't want to stay on the court. But for me was important to just keep calm and try to play. In the end I just play really well."

Pennetta had 34 unforced errors and just 15 winners. Sharapova topped her in both categories with 42 unforced errors and 27 winners to go with 11 double faults.

Pennetta broke two-time Indian Wells champion Sharapova twice in the final set, winning the last seven games.

"She got in a really good rhythm," said Sharapova, who didn't notice Pennetta's meltdown. "Everything I gave her she was able to hit back solid with pace."

Williams committed 52 unforced errors and had nine double faults to go with 13 aces and 31 winners in the up-and-down match played in 90-degree (32 Celsius) heat.

"I'm just trying to find my bearings," the world's top-ranked player said. "Little off this week, but like I said, I'm just happy to be here."

Williams set up match point with a 128-mph ace and won when Stephens dumped a backhand into the net, one of her 36 errors.

Williams broke Stephens three times in the final set of her third match at Indian Wells since ending a 14-year personal boycott of the tournament, where she has won two titles.

"The crowd has been really great," Williams said. "It's been really relaxing here. I just feel I don't want to leave."

In third round men's play, Nadal beat Donald Young 6-4, 6-2 in a matchup of lefties.

"I feel confident that I am playing much better than one month and a half ago," Nadal said. "I feel closer to be what I am, what I want to be, and it's a positive victory for me."

Sixth-seeded Milos Raonic beat Alexandr Dolgopolov, 7-6 (2), 6-4; No. 11 Grigor Dimitrov lost to 17th-seeded Tommy Robredo, 6-4, 1-6, 7-5; Jack Sock upset 15th-seeded Roberto Bautista Agut, 3-6, 6-3, 6-2 to earn his first meeting against Federer; and No. 9 seed Tomas Berdych beat Steve Johnson, 6-4, 6-2.

No. 12 Carla Suarez Navarro beat Heather Watson 7-6 (5), 3-6, 6-1 to reach the quarterfinals, where she will play third-seeded Simona Halep, a 6-4, 6-4 winner over 14th-seeded Karolina Pliskova.

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