TEN-US OPEN-NISHIKORI-PAIRE(01 of20)
Open Image ModalJapan\'s Kei Nishikori serves to France\'s Benoit Paire during their Mens Singles round 1 match of the US Open at USTA Billie Jean King National Tennis Center in New York on August 31, 2015. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images) (credit:JEWEL SAMAD via Getty Images)
US Open Tennis(02 of20)
Open Image ModalBenoit Paire, of France, left, greets Kei Nishikori, of Japan, at the net after winning their first round match of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(03 of20)
Open Image ModalKei Nishikori, of Japan, cools off between games against Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(04 of20)
Open Image ModalKei Nishikori, of Japan, returns a shot to Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(05 of20)
Open Image ModalKei Nishikori, of Japan, returns a shot against Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(06 of20)
Open Image ModalKei Nishikori, of Japan, reacts after losing a point to Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(07 of20)
Open Image ModalKei Nishikori, of Japan, returns a shot to Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(08 of20)
Open Image ModalKei Nishikori, of Japan, serves against Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(09 of20)
Open Image ModalKei Nishikori, of Japan, returns a shot to Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(10 of20)
Open Image ModalKei Nishikori, of Japan, wipes sweat from his face between points against Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(11 of20)
Open Image ModalKei Nishikori, of Japan, unwraps a new racket between games against Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(12 of20)
Open Image ModalKei Nishikori, of Japan, returns a shot to Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
TEN-US OPEN-NISHIKORI-PAIRE(13 of20)
Open Image ModalJapan\'s Kei Nishikori returns a shot to France\'s Benoit Paire during their Mens Singles round 1 match of the US Open at USTA Billie Jean King National Tennis Center in New York on August 31, 2015. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images) (credit:JEWEL SAMAD via Getty Images)
US Open Tennis(14 of20)
Open Image ModalKei Nishikori, of Japan, reacts after a point against Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
US Open Tennis(15 of20)
Open Image ModalKei Nishikori, of Japan, checks the scoreboard between serves against Benoit Paire, of France, during the first round of the U.S. Open tennis tournament, Monday, Aug. 31, 2015, in New York. (AP Photo/Charles Krupa) (credit:ASSOCIATED PRESS)
2015 U.S. Open - Day 1(16 of20)
Open Image ModalNEW YORK, NY - AUGUST 31: Kei Nishikori of Japan reacts against Benoit Paire of France during their Men\'s Single First Round match on Day One of the 2015 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images) (credit:Streeter Lecka via Getty Images)
2015 U.S. Open - Day 1(17 of20)
Open Image ModalNEW YORK, NY - AUGUST 31: Kei Nishikori of Japan walks off of the court after losing against Benoit Paire of France during their Men\'s Single First Round match on Day One of the 2015 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images) (credit:Streeter Lecka via Getty Images)
2015 U.S. Open - Day 1(18 of20)
Open Image ModalNEW YORK, NY - AUGUST 31: Kei Nishikori of Japan returns a shot against Benoit Paire of France during their Men\'s Single First Round match on Day One of the 2015 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images) (credit:Streeter Lecka via Getty Images)
TEN-US OPEN-NISHIKORI-PAIRE(19 of20)
Open Image ModalJapan\'s Kei Nishikori returns to France\'s Benoit Paire during their Mens Singles round 1 match of the US Open at USTA Billie Jean King National Tennis Center in New York on August 31, 2015. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images) (credit:JEWEL SAMAD via Getty Images)
2015 U.S. Open - Day 1(20 of20)
Open Image ModalNEW YORK, NY - AUGUST 31: Kei Nishikori of Japan walks off of the court after losing against Benoit Paire of France during their Men\'s Single First Round match on Day One of the 2015 US Open at the USTA Billie Jean King National Tennis Center on August 31, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images) (credit:Streeter Lecka via Getty Images)