Zverev, playing with a bone bruise in his right knee, said he was bothered by some of the cheering coming from Fritz's guest box in the fifth set.
Djokovic gets into it with fans after reaching Wimbledon quarterfinals
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“I do feel like a cow on ice sometimes," Zverev said.
Zverev overcomes knee issue to beat Norrie at Wimbledon then appeals to Guardiola for coaching
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