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On the women’s side, Maria Sharapova rallied from a break down in the first set to oust Petra Kvitova 7-5, 6-1 and earn a spot in the semifinals. She’s been a finalist at Key Biscayne five times, but never the champion.

“I love the energy here,” she said.

The fourth-seeded Sharapova, who needed three-setters to get through her two most recent matches at Key Biscayne, feasted on 30 unforced errors by the eighth-seeded Kvitova. Sharapova won 11 of the final 13 games and moved into a semifinal matchup with Serena Williams, the defending champion who won 62 of 100 points in her 6-2, 6-2 romp over fifth-seeded Angelique Kerber.

Williams broke Kerber twice in each set, faced only one break point and had a more than 2-to-1 advantage in winners. She’s 15-2 all-time against Sharapova, winning the last 14 matchups, including the final at Key Biscayne last year.

“When you’re playing champions, you like to play your best,” Williams said. “She always gives me her best. … I love playing her. I really do. It doesn’t matter what surface. She’s one of my favorite people to play.”

Sharapova said she was eager to face Williams again.

“It’s no secret that she’s been a big challenge of mine, an opponent that obviously I would love to beat,” Sharapova said.

Also, former No. 1 Martina Hingis teamed with Sabine Lisicki to reach the doubles quarterfinals. And foot and vehicle traffic outside the tennis center was briefly halted during the night session when a suspicious backpack was found near the main gate, but Miami-Dade police responded and quickly determined there was no threat.