Serena Williams of the U.S. almost falls down after trying to return a shot to Bethanie Mattek-Sands of the U.S. during their match at the U.S. Open Championships tennis tournament in New York, ... more 
Serena Williams of the U.S. almost falls down after trying to return a shot to Bethanie Mattek-Sands of the U.S. during their match at the U.S. Open Championships tennis tournament in New York, September 4, 2015. REUTERS/Eduardo Munoz less 
1 / 30
Reuters | Photo By EDUARDO MUNOZ / REUTERS
Fri, Sep 4, 2015 8:08 PM EDT