Roberta Vinci fell apart after losing the opening set on a foot fault, allowing No. 2 seed Angelique Kerber to take last nine games and win their U.S. Open quarterfinal 7-5, 6-0 yesterday.
Kerber, who has a chance to overtake Serena Williams at No. 1 after the tournament, moved into her third Grand Slam semifinal of the year. She won the Australian Open in January, then lost to Williams in the Wimbledon final in July.
At last year’s U.S. Open, Vinci stunned Williams in the semifinals, ending the American’s bid for a calendar-year Grand Slam.
Yesterday, she was two points away from taking the first set when she served for it at 5-4, but she got broken there. Then, trailing 6-5, and serving at love-40, Vinci was called for a foot fault on a second serve.
That resulted in a double-fault that ceded the set. As she walked to the sideline, Vinci looked at the line judge who made the call and smiled sarcastically, giving him a thumb’s up and applauding with her racket.
In the second set, Vinci won only 10 points.
She will now face either Caroline Wozniacki – twice a US Open runner-up – or surprise quarter-finalist Anastasija Sevastova for a place in the final.
Wozniacki will play Sevastova, who knocked out Britain’s Johanna Konta, later on Tuesday.

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