Serena Williams, of the United States, waves to fans after winning her match with Madison Keys, of the United States, during the fourth round of the US Open tennis tournament on Sunday.

Serena Williams, of the United States, waves to fans after winning her match with Madison Keys, of the United States, during the fourth round of the US Open tennis tournament on Sunday.
Serena Williams, of the United States, waves to fans after winning her match with Madison Keys, of the United States, during the fourth round of the US Open tennis tournament on Sunday.
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