EN FOTOS: Federer y Wawrinka, duelo de suizos en semis del US Open
A spectator holds an umbrella during a rain delay in the quarterfinal match between Victoria Azarenka, of Belarus, and Simona Halep, of Romania, at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Adam Hunger) (Adam Hunger / AP)
Geneen McCauley, of New York, takes cover under an umbrella during a weather delay in the quarterfinal match between Simona Halep, of Romania, and Victoria Azarenka, of Belarus, at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/David Goldman) (David Goldman / AP)
Spectators take cover during a rain delay in the quarterfinal match between Victoria Azarenka, of Belarus, and Simona Halep, of Romania, at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/David Goldman) (David Goldman / AP)
Spectators watch a quarterfinal match between Stan Wawrinka, of Switzerland, and Kevin Anderson, of South Africa, at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Kathy Kmonicek) (Kathy Kmonicek / AP)
Roger Federer of Switzerland serves the ball to Richard Gasquet of France during their 2015 US Open Men’s singles quarterfinals match at the USTA Billie Jean King National Tennis Center in New York on September 9, 2015. Federer won 6-3, 6-3, 6-1. AFP PHOTO/JEWEL SAMADJEWEL SAMAD/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (JEWEL SAMAD / AFP/Getty Images)
Simona Halep, of Romania, reacts after beating Victoria Azarenka, of Belarus, during a quarterfinal match at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Seth Wenig) (Seth Wenig / AP)
Simona Halep, of Romania, reacts after beating Victoria Azarenka, of Belarus, during a quarterfinal match at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Seth Wenig) (Seth Wenig / AP)
NEW YORK, NY - SEPTEMBER 09: Simona Halep of Romania celebrates after defeating Victoria Azarenka of Belarus during their Women’s Singles Quarterfinals match on Day Ten of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 9, 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)
The sun sets behind the New York City skyline as seen from the Billie Jean King National Tennis Center at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Seth Wenig) (Seth Wenig / AP)
Kevin Anderson (C) of South Africa serves the ball to Stan Wawrinka of Switzerland during their 2015 US Open Men’s singles quarterfinals match at the USTA Billie Jean King National Tennis Center in New York on September 9, 2015. Wawrinka won 6-4, 6-4, 6-0. AFP PHOTO/JEWEL SAMADJEWEL SAMAD/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (JEWEL SAMAD / AFP/Getty Images)
Roger Federer of Switzerland serves the ball to Richard Gasquet of France during their 2015 US Open Men’s singles quarterfinals match at the USTA Billie Jean King National Tennis Center in New York on September 9, 2015. Federer won 6-3, 6-3, 6-1. AFP PHOTO/JEWEL SAMADJEWEL SAMAD/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (JEWEL SAMAD / AFP/Getty Images)
2015 US Open - Day Ten (Mike Stobe / Getty Images for the USTA)
Simona Halep, of Romania, reacts after beating Victoria Azarenka, of Belarus, during a quarterfinal match at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Seth Wenig) (Seth Wenig / AP)
Simona Halep, of Romania, reacts after beating Victoria Azarenka, of Belarus, during a quarterfinal match at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Seth Wenig) (Seth Wenig / AP)
La rumana Simona Halep festeja luego de imponerse a la bielorrusa Victoria Azarenka en los cuartos de final del US Open, el miércoles 9 de septiembre de 2015 (AP Foto/Seth Wenig) ** Usable by HOY and ELSENT Only ** (Seth Wenig / AP)
Simona Halep of Romania celebrates match point against Victoria Azarenka of Belarus during their 2015 US Open Women’s Singles-Quarterfinals at the USTA Billie Jean King National Tennis Center September 9, 2015 in New York. AFP PHOTO/ TIMOTHY A. CLARYTIMOTHY A. CLARY/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (TIMOTHY A. CLARY / AFP/Getty Images)
Simona Halep of Romania celebrates match point against Victoria Azarenka of Belarus during their 2015 US Open Women’s Singles-Quarterfinals at the USTA Billie Jean King National Tennis Center September 9, 2015 in New York. AFP PHOTO/ TIMOTHY A. CLARYTIMOTHY A. CLARY/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (TIMOTHY A. CLARY / AFP/Getty Images)
Victoria Azarenka of Belarus returns a shot to Simona Halep of Romania during their 2015 US Open Women’s Singles Quarterfinals match at the USTA Billie Jean King National Tennis Center September 9, 2015 in New York. AFP PHOTO/KENA BETANCURKENA BETANCUR/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (KENA BETANCUR / AFP/Getty Images)
Victoria Azarenka of Belarus plays against Simona Halep of Romania during their 2015 US Open Women’s Singles - Quarterfinals at the USTA Billie Jean King National Tennis Center September 9, 2015 in New York. AFP PHOTO / TIMOTHY A. CLARYTIMOTHY A. CLARY/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (TIMOTHY A. CLARY / AFP/Getty Images)
Victoria Azarenka of Belarus plays against Simona Halep of Romania during their 2015 US Open Women’s Singles - Quarterfinals at the USTA Billie Jean King National Tennis Center September 9, 2015 in New York. AFP PHOTO / TIMOTHY A. CLARYTIMOTHY A. CLARY/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (TIMOTHY A. CLARY / AFP/Getty Images)
Petra Kvitova of the Czech Republic plays against Flavia Pennetta of Italy during their 2015 US Open Women’s Singles - Quarterfinals at the USTA Billie Jean King National Tennis Center September 9, 2015 in New York. Pennetta won 4-6, 6-4, 6-2. AFP PHOTO / TIMOTHY A. CLARYTIMOTHY A. CLARY/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (TIMOTHY A. CLARY / AFP/Getty Images)
Flavia Pennetta of Italy celebrates match point against Petra Kvitova of the Czech Republic during their 2015 US Open Women’s Singles - Quarterfinals at the USTA Billie Jean King National Tennis Center September 9, 2015 in New York. Pennetta won 4-6, 6-4, 6-2. AFP PHOTO / TIMOTHY A. CLARYTIMOTHY A. CLARY/AFP/Getty Images ** OUTS - ELSENT, FPG - OUTS * NM, PH, VA if sourced by CT, LA or MoD ** (TIMOTHY A. CLARY / AFP/Getty Images)
Kevin Anderson, of South Africa, strikes the ball during his serve to Stan Wawrinka, of Switzerland, during a quarterfinal match at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/David Goldman) (David Goldman / AP)
Roger Federer, of Switzerland, serves to Richard Gasquet, of France, during a quarterfinal match at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Seth Wenig) (Seth Wenig / AP)
Richard Gasquet, of France, reacts between points against Roger Federer, of Switzerland, during a quarterfinal match at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Adam Hunger) (Adam Hunger / AP)
Spectators try to get the attention of Stan Wawrinka, of Switzerland, not pictured, as Kevin Anderson, of South Africa, wipes sweat after losing to Wawrinka during a quarterfinal match at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/David Goldman) (David Goldman / AP)
Comedian Jimmy Fallon, left, and singer Justin Timberlake dance during a quarterfinal match between Roger Federer, of Switzerland, and Richard Gasquet, of France, at the U.S. Open tennis tournament, Wednesday, Sept. 9, 2015, in New York. (AP Photo/Adam Hunger) (Adam Hunger / AP)