US Open

Stanislas Wawrinka of Switzerland is hit with a volley by Tomas Berdych of the Czech Republic at...

Stanislas Wawrinka of Switzerland is hit with a volley by Tomas Berdych of the Czech Republic at the U.S. Open tennis championships in New York September 3, 2013. (REUTERS/Mike Segar)

, Last Updated: 9:52 PM ET

Stanislas Wawrinka of Switzerland is hit with a volley by Tomas Berdych of the Czech Republic at the U.S. Open tennis championships in New York September 3, 2013. (REUTERS/Mike Segar)

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