NOVI SAD, SERBIA - FEBRUARY 01: Roger Federer (L) and Stanislas Wawrinka (L) react during the men's doubles match of Marco Chiudinelli and Michael Lammer of Switzerland against Filip Krajinovic and Nenad Zimonjic of Serbia on day two of the Davis Cup match between Serbia and Switzerland on February, 2014 in Novi Sad, Serbia. (Photo by Srdjan Stevanovic/Getty Images)
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