WIMBLEDON, England _ Ashleigh Barty, ranked No. 1 in the world, opened her match Monday with four aces. But it was Alison Riske who had the winning hand.
After dropping the first set, Riske rallied for a 3-6, 6-2, 6-3 victory that halted the Australian's winning streak at 15 matches in a row.
"I think honestly the biggest key for me has just been to battle from start to finish of every match that I've been a part of," said Riske of Pittsburgh, who advanced to her first quarterfinal in a major championship. "Judging by the score line, they haven't all gone perfect. I feel like I've been there in every moment, looking to impose myself."
Barty had been 11-0 against Americans this year, knocking off five on her way to a victory at the French Open, her first Grand Slam title.
"Tough one," Barty said of the loss. "I think I started well. I was sticking to how I wanted to play. Then in the second set, I think my serve let me down. I let Alison get back into the match too many times, having looks at second serves.
"Overall, I didn't play a poor match. When I needed to, when the big moments were there, Alison played better today. Tough one to swallow but I lost to a better player."
On Tuesday, Riske will play Serena Williams, who beat Carla Suarez Navarro, 6-2, 6-2.
