IMAGE: Switzerland's Stanislas Wawrinka puts an ice pack on his knee during his Wimbledon first round defeat against Russia's Daniil Medvedev at the All England Lawn Tennis and Croquet Club in London. Photograph: David Ramos/Getty Images
World number four Stanislas Wawrinka has withdrawn from this month's Rogers Cup in Montreal and the Western & Southern Open in Cincinnati due to a knee injury, the Swiss said on Wednesday.
The 32-year-old Geneva Open winner battled with the injury throughout the grasscourt season and was knocked out in the first round of the Aegon Championships and Wimbledon.
"After much consideration and consultation with my doctors and my team, I have decided to skip Canada and Cincinnati to be on the safe side, although I've been battling hard to be fit for these events," Wawrinka said on his official website.
The U.S Open champion could return to defend his title when the final grand slam of the season begins on Aug. 28.
