TENNIS PHOTOS

  • NEW YORK, NY - SEPTEMBER 02: Roger Federer of Switzerland returns a shot against Roberto Bautista Agut of Spain during their men's singles fourth round match on Day Nine of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images)

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  • NEW YORK, NY - SEPTEMBER 02: Roger Federer of Switzerland returns a shot against Roberto Bautista Agut of Spain during their men's singles fourth round match on Day Nine of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images)

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  • Roger Federer, of Switzerland, eyes the ball on a return against Roberto Bautista Agut, of Spain, during the fourth round of the 2014 U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Charles Krupa)

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  • Roger Federer, of Switzerland, drops a shot at the net against Roberto Bautista Agut, of Spain, during the fourth round of the 2014 U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Charles Krupa)

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  • Roger Federer, of Switzerland, tosses the ball on a serve against Roberto Bautista Agut, of Spain, during the fourth round of the 2014 U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Charles Krupa)

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  • Roger Federer, of Switzerland, returns against Roberto Bautista Agut, of Spain, during the fourth round of the 2014 U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Charles Krupa)

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  • Roger Federer, of Switzerland, returns to Roberto Bautista Agut, of Spain, during the fourth round of the U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Charles Krupa)

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  • NEW YORK, NY - SEPTEMBER 02: The sky is seen above Arthur Ashe Stadium on Day Nine of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Mike Stobe/Getty Images for USTA)

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  • NEW YORK, NY - SEPTEMBER 02: Gael Monfils of France reacts to a point while playing against Grigor Dimitrov of Bulgaria in their men's singles fourth round match on Day Nine of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris Trotman/Getty Images for USTA)

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  • NEW YORK, NY - SEPTEMBER 02: Gael Monfils of France reacts to a point while playing against Grigor Dimitrov of Bulgaria in their men's singles fourth round match on Day Nine of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Chris Trotman/Getty Images for USTA)

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