FOTOS: Jornada en el Abierto de Estados Unidos
Spectators watch play between Serena Williams, right, and Kiki Bertens, of the Netherlands, during the second round of the U.S. Open tennis tournament, Wednesday, Sept. 2, 2015, in New York. (AP Photo/Matt Rourke) (Matt Rourke / AP)
NEW YORK, NY - SEPTEMBER 02: Kiki Bertens of the Netherlands reacts against Serena Williams of the United States during their Women’s Singles Second Round match on Day Three of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images) ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (Alex Goodlett / Getty Images)
NEW YORK, NY - SEPTEMBER 02: Dominika Cibulkova of Slovakia returns a shot to Jessica Pegula of the United States during their Women’s Singles Second Round match on Day Three of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images) ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (Al Bello / Getty Images)
NEW YORK, NY - SEPTEMBER 02: Fans watch from Louis Armstrong Stadium as Rafael Nadal of Spain plays against Diego Schwartzman of Argentina during their Men’s Singles Second Round match on day three of the 2015 U.S. Open at the USTA Billie Jean King National Tennis Center on September 2, 2015 in New York City. (Photo by Mike Stobe/Getty Images for the USTA) ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (Mike Stobe / Getty Images for the USTA)
NEW YORK, NY - SEPTEMBER 02: Polona Hercog of Slovenia returns a shot against Eugenie Bouchard of Canada during their Women’s Singles Second Round match on Day Three of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images) ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (Streeter Lecka / Getty Images)
Venus Williams, of the United States, reacts during a match against Irina Falconi, of the United States, at the U.S. Open tennis tournament in New York, Wednesday, Sept. 2, 2015. (AP Photo/Kathy Willens) (Kathy Willens / AP)
MCX320. FLUSHING MEADOWS (ESTADOS UNIDOS), 02/09/2015.- Belinda Bencic de Suiza celebra su victoria ante Misaki Doi de Japón, durante el partido de la tercera jornada del Abierto de Estados Unidos que se disputa en las pistas de Flushing Meadows, Nueva York, el 2 de septiembre del 2015. EFE/PETER FOLEY ** Usable by HOY and FL-ELSENT Only ** (PETER FOLEY / EFE)
Misaki Doi, of Japan, hits a forehand to Belinda Bencic, of Switzerland, during the second round of the U.S. Open tennis tournament in New York, Wednesday, Sept. 2, 2015. (AP Photo/Julio Cortez) (Julio Cortez / AP)
Irina Falconi of the US reacts to a point while playing Venus Williams of the US during their US Open 2015 second round women’s singles match at the USTA Billie Jean King National Center September 2, 2015 in New York. AFP PHOTO/DON EMMERTDON EMMERT/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (DON EMMERT / AFP/Getty Images)
Belinda Bencic, of Switzerland, reacts after taking a game from Misaki Doi, of Japan, during the second round of the U.S. Open tennis tournament in New York, Wednesday, Sept. 2, 2015. (AP Photo/Julio Cortez) (Julio Cortez / AP)
Venus Williams of the US hits a return to Irina Falconi of the US during their US Open 2015 second round women’s singles match at the USTA Billie Jean King National Center September 2, 2015 in New York. AFP PHOTO/DON EMMERTDON EMMERT/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (DON EMMERT / AFP/Getty Images)
MCX310. FLUSHING MEADOWS (ESTADOS UNIDOS), 02/09/2015.- Belinda Bencic de Suiza responde una bola ante Misaki Doi de Japón, durante el partido de la tercera jornada del Abierto de Estados Unidos que se disputa en las pistas de Flushing Meadows, Nueva York, el 2 de septiembre del 2015. EFE/PETER FOLEY ** Usable by HOY and FL-ELSENT Only ** (PETER FOLEY / EFE)
Belinda Bencic, of Switzerland, tosses her racket after losing a point to Misaki Doi, of Japan, during the second round of the U.S. Open tennis tournament in New York, Wednesday, Sept. 2, 2015. (AP Photo/Julio Cortez) (Julio Cortez / AP)
Venus Williams, of the United States, reaches for a shot from Irina Falconi, of the United States, during the U.S. Open tennis tournament in New York, Wednesday, Sept. 2, 2015. (AP Photo/Kathy Willens) (Kathy Willens / AP)
Rafael Nadal, of Spain, reacts after beating Diego Schwartzman, of Argentina, during the second round of the U.S. Open tennis tournament, Wednesday, Sept. 2, 2015, in New York. (AP Photo/Frank Franklin II) (Frank Franklin II / AP)
Rafael Nadal, of Spain, reacts after beating Diego Schwartzman, of Argentina, during the second round of the U.S. Open tennis tournament, Wednesday, Sept. 2, 2015, in New York. (AP Photo/Frank Franklin II) (Frank Franklin II / AP)
Rafael Nadal, of Spain, reacts after beating Diego Schwartzman, of Argentina, during the second round of the U.S. Open tennis tournament, Wednesday, Sept. 2, 2015, in New York. (AP Photo/Frank Franklin II) (Frank Franklin II / AP)
NEW YORK, NY - SEPTEMBER 02: Rafael Nadal of Spain reacts after defeating Diego Schwartzman of Argentina during their Men’s Singles Second Round match on Day Three of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images) ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (Clive Brunskill / Getty Images)
Rafael Nadal, of Spain, signs autographs for fans after beating Diego Schwartzman, of Argentina, during the second round of the U.S. Open tennis tournament, Wednesday, Sept. 2, 2015, in New York. (AP Photo/Frank Franklin II) (Frank Franklin II / AP)