Coco Gauff has no answer for runaway world number one Iga Swiatek in San Diego

Iga Swiatek defeated Coco Gauff in straight sets in their quarter-final match at the San Diego Open, advancing to a semi-final face-off with Jessica Pegula.

The world number one took Gauff down 6-0 6-3 in a rematch of this year's French Open final, beating the American for the third time this season.

Gauff struggled to keep up, losing all three of her potential break points and winning only 50 per cent of first serves to Swiatek's 80 per cent.

Swiatek ran a top streak of eight games in a row and won five out of nine break points to end the match in just over an hour.

"I just kept my focus and I'm happy that I stayed composed tonight," Swiatek said. "It was one of those matches where I felt in control from the first point."

"I just wanted to be really efficient," said Swiatek.

Gauff said: "I felt like I was overplaying... with her you kind of sometimes feel like you have to overplay, just because she's playing so good."

"I've lost to her so many times, and I just didn't have it today," the American added. "Each time I play her, I learn a lot, like that I overplayed on certain shots which caused me to make more errors."

Swiatek moves on to face Gauff's doubles partner, Jessica Pegula, in Saturday's semi-finals, after she defeated countrywoman Madison Keys 6-4, 7-5.

"We always play great, physical matches, so I'm looking forward to playing Jessica," said Swiatek.

In the other semifinal, Donna Vekic of Croatia takes on American Danielle Collins.

Vekic beat third-seeded Aryna Sabalenka of Belarus 6-4, 6-7 (5), 6-1, while Collins eliminated second-seeded Paula Badosa of Spain 7-6 (5), 6-4.

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