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Roberta Vinci of Italy reacts during her quarterfinal match against Kristina Mladenovic of France at St. Petersburg Ladies Trophy tennis tournament on February 3, 2017 in St. Petersburg, Russia. (Photo by Mike Kireev/NurPhoto via Getty Images) (Photo by Mike Kireev/NurPhoto via Getty Images)

Roberta Vinci of Italy reacts during her quarterfinal match against Kristina Mladenovic of France at St. Petersburg Ladies Trophy tennis tournament on February 3, 2017 in St. Petersburg, Russia. (Photo by Mike Kireev/NurPhoto via Getty Images) (Photo by Mike Kireev/NurPhoto via Getty Images)