New world number Karolina Pliskova advanced to the quarter finals of the Rogers Cup after opponent Naomi Osaka pulled out through injury.
An absorbing encounter had just gone to a third set, when Japanese teenager Osaka called for the trainer after being broken in the opening game of the decider. She decided to retire, rather than risking serious injury, with Pliskova advancing 6-2, 6-7, 1-0.
Playing her first tournament since her shock second round defeat at Wimbledon, Pliskova had won four successive games en route to taking the first set, before Osaka fought back well in the second to take the tie break 7-4.
— Karolina Pliskova (@KaPliskova) August 10, 2017
“She played well, especially in the second set she was fighting pretty hard, much better than the first,” said Pliskova.
“I was just trying to stay in the game, the first game of the third set was very tough I didn't even know she was injured.”
Second seed Simona Halep and former world number one Caroline Wozniacki both cruised into the quarter-finals in Toronto.
Defending champion Halep demolished Barbora Strycova 6-1, 6-0, while Wozniacki was equally impressive in a 6-3, 6-1 win over Agnieszka Radwanska.
— Rogers Cup Toronto (@rogerscup) August 11, 2017
But there were two major upsets after both Angelique Kerber and Venus Williams crashed out.
Kerber was beaten 6-2, 6-2 by American Sloane Stephens, while Elina Svitolina beat Williams 6-2, 6-1.