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FRANKFURT AM MAIN, GERMANY - FEBRUARY 01: Tommy Haas of Germany plays a forehand in his double match with Philipp Kohlschreiber against Fernando Verdasco and David Marrero of Spain on Day 2 of the Davis Cup First round match between Germany and Spain at Fraport Arena on February 1, 2014 in Frankfurt am Main, Germany. (Photo by Dennis Grombkowski/Bongarts/Getty Images)

FRANKFURT AM MAIN, GERMANY - FEBRUARY 01:  Tommy Haas of Germany plays a forehand in his double match with Philipp Kohlschreiber against Fernando Verdasco and David Marrero of Spain on Day 2 of the Davis Cup First round match between Germany and Spain at Fraport Arena on February 1, 2014 in Frankfurt am Main, Germany.  (Photo by Dennis Grombkowski/Bongarts/Getty Images)