TORONTO (AP) — Top-seeded Coco Gauff tumbled out of the National Bank Open on Friday, falling 6-4, 6-1 to 14th-seeded Diana Shnaider in windy conditions at Sobeys Stadium. Preparing for her U.S.

Open title defense, Gauff was broken trailing 5-4 in the first set. The 20-year-old American double-faulted down 2-1 in the second and Shnaider held serve to go up 4-1. “I just wasn’t finding my timing well,” said Gauff, the No.

2-ranked player in the world. “I had a lot of unforced errors and a lot of double faults. She played steady and she didn’t give me any free points.

She was playing her first hard-court event since April. “I question whether I should have played (in Toronto) or not, but I wanted to test myself,” Gauf said. “I didn’t have high expectations, but I wish I could have competed better today, even if it resulted in a loss.

I don’t think I competed well.” Shnaider, also 20, sealed the victory with another break to set up a quarterfinal match against No. 6 Liudmila Samsonova, a 6-2, 6-4 winner over Elise Mertens.

“I know Coco is very physically prepared for everyone on tour, and she’s running very well, she’s covering all of the balls and all the angles on the court,” Shnaider said. “So when there were long rallies and I was winning them I was like, ‘Wow, I just beat Coco in long rallies. I am good today.

’ I tried to play it cool, but inside I was like, ‘Yes! I made it!’” In the late match, No. 2 Aryna Sabalenka beat Katie Bou.