American Amanda Anisimova ousts top seed Aryna Sabalenka in Charleston

American Amanda Anisimova rallied after losing the opening set to beat top-seeded Aryna Sabalenka of Belarus 3-6, 6-4, 6-3 on Thursday and reach the quarterfinals of the Charleston Open.

In more surprises, Ekaterina Alexandrova of Russia and CoCo Vandeweghe of the United States both reached the final eight with wins over seeded opponents.

Alexandrova defeated No. 3 seed Karolina Pliskova of the Czech Republic 6-3, 6-1 while Vandeweghe topped countrywoman and sixth-seeded Jessica Pegula 6-4, 3-6, 6-4.

Spain's Paula Badosa, the second seed, dropped her first set before fighting off American Claire Liu for a 3-6, 7-6 (8), 6-1 victory to move into the quarters.

Belinda Bencic of Switzerland, the Olympic gold medalist last summer, defeated ninth-seeded Madison Keys of the United States 6-4, 6-4.

Fourth-seeded Ons Jabeur did double duty, winning twice Thursday to make the quarters. Jabeur's match with Emma Navarro was halted Wednesday because of severe weather with her leading 6-3, 5-2. The two returned Thursday and Jabeur quickly won four straight points to close things out.

Later, Jabeur eliminated IrinaCamelia Begu of Romania 6-3, 62.

The Tunisian was frustrated she and Navarro couldn't finish the match on Wednesday. "But, you know, it is what it is," she said. "I'm glad that I finished quick in the morning. And tonight was really tricky."

Jabeur said Begu found some rhythm in the middle of the match. "But I'm glad that I really won my serve at the end," she said.

Magda Linette of Poland had it worse than Jabeur. Linette, whose Wednesday match was also washed out, beat seventhseeded Leylah Fernandez of Canada 3-6, 6-3, 6-4 in the afternoon. Linette saved four breaks points to win in a 17-minute final game. She returned at night to top Kaia Kanepi of Estonia 63, 4-6, 6-2.

In all, Linette played 55 games in four hours, 38 minutes and 16 seconds of winning tennis to advance.

Sabalenka had won her first match in nearly six weeks on Wednesday and took the opening set without too much trouble. But Anisimova, 20, who is ranked 47th in the world, found her rhythm after the break as Sabalenka began to make mistakes.

Sabalenka had two straight double faults to trail 5-3 and Anisimova served out the set. Anisimova broke Sabalenka's serve twice in the third set for a 4-0 lead. Sabalenka closed to 5-4, but Anisimova finished the match with her sixth ace and improved to 3-0 against the world's fifth-ranked player.

Anisimova will face Vandeweghe on Friday to reach the semifinals.

"It's a pretty good result, like in the quarterfinal, and especially against a top seed," Anisimova said. "It's a big confidence boost."

Badosa also got off to a bad start against the 21-year-old Liu. Badosa was up 5-3 in the second set when Liu won three of the last four games to set up the tie breaker. Liu was two points away from winning the match four times in the tiebreak, yet Badosa turned away each challenge.

Badosa converted her fourth set point off a backhand winner to close the set, which lasted 72 minutes. She gained control after that in the third set to advance.

In the quarterfinals, Badosa takes on Bencic, who overcame a nearly two-hour rain delay after winning the opening set against Keys. After the rain stopped and the court was dried, Bencic held off the American, who was the last remaining past champion in the field.

Anhelina Kalinina of Ukraine topped No. 12 seed Alize Cornet of France 7-6 (5), 7-5.

The tournament has been affected by bad weather all week and Thursday was no different. The forecast calls for dry weather on Friday and through Sunday's championship match.