Grass can be slippery, especially when it's damp, and this week, London has been plagued by rain. Dan Evans was down in the first set against Stan Wawrinka at Queen's club when he slipped and hit the turf.

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It looked like the Brit hurt his left knee, and limped—with the help of a concerned Wawrinka—back to his chair. Evans would carry on, and lose the match, 6-3, 6-4.

Evans just won an ATP Challenger in Nottingham, while Wawrinka is the No. 7 seed this week.