Australian Open Tennis(01 of20)
Open Image ModalKei Nishikori of Japan reacts to a lost point to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Lee Jin-man) (credit:ASSOCIATED PRESS)
Australian Open Tennis(02 of20)
Open Image ModalKei Nishikori of Japan looks down as he plays Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Lee Jin-man) (credit:ASSOCIATED PRESS)
Australian Open Tennis(03 of20)
Open Image ModalKei Nishikori of Japan leaves Rod Laver Arena after his quarterfinal loss to Stan Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Lee Jin-man) (credit:ASSOCIATED PRESS)
Australian Open Tennis(04 of20)
Open Image ModalKei Nishikori of Japan leaves Rod Laver Arena after his quarterfinal loss to Stan Wawrinka of Switzerland at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Vincent Thian) (credit:ASSOCIATED PRESS)
Australian Open Tennis(05 of20)
Open Image ModalKei Nishikori of Japan reacts to a lost point to Stan Wawrinka of Switzerland in their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Bernat Armangue) (credit:ASSOCIATED PRESS)
Australian Open Tennis(06 of20)
Open Image ModalStan Wawrinka of Switzerland, left, is congratulated by Kei Nishikori of Japan at the net after winning their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Rob Griffith) (credit:ASSOCIATED PRESS)
Australian Open Tennis(07 of20)
Open Image ModalStan Wawrinka of Switzerland, left, and Kei Nishikori of Japan meet at the net after Wawrinka won their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Rob Griffith) (credit:ASSOCIATED PRESS)
Australian Open Tennis(08 of20)
Open Image ModalStan Wawrinka of Switzerland, right, is congratulated by Kei Nishikori of Japan at the net after winning their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Vincent Thian) (credit:ASSOCIATED PRESS)
Australian Open Tennis(09 of20)
Open Image ModalKei Nishikori of Japan serves to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Bernat Armangue) (credit:ASSOCIATED PRESS)
Australian Open Tennis(10 of20)
Open Image ModalKei Nishikori of Japan reacts to a lost point to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Vincent Thian) (credit:ASSOCIATED PRESS)
Australian Open Tennis(11 of20)
Open Image ModalKei Nishikori of Japan drops a racket as he plays Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Bernat Armangue) (credit:ASSOCIATED PRESS)
Australian Open Tennis(12 of20)
Open Image ModalKei Nishikori of Japan plays a shot to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Bernat Armangue) (credit:ASSOCIATED PRESS)
Australian Open Tennis(13 of20)
Open Image ModalKei Nishikori of Japan falls to the court as he plays Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Lee Jin-man) (credit:ASSOCIATED PRESS)
Australian Open Tennis(14 of20)
Open Image ModalKei Nishikori of Japan reacts to a lost point to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Vincent Thian) (credit:ASSOCIATED PRESS)
Australian Open Tennis(15 of20)
Open Image ModalKei Nishikori of Japan follows through on a shot to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Lee Jin-man) (credit:ASSOCIATED PRESS)
Australian Open Tennis(16 of20)
Open Image ModalKei Nishikori of Japan serves to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Rob Griffith) (credit:ASSOCIATED PRESS)
Australian Open Tennis(17 of20)
Open Image ModalKei Nishikori of Japan makes a forehand return to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Bernat Armangue) (credit:ASSOCIATED PRESS)
Australian Open Tennis(18 of20)
Open Image ModalKei Nishikori of Japan makes a forehand return to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Vincent Thian) (credit:ASSOCIATED PRESS)
Australian Open Tennis(19 of20)
Open Image ModalKei Nishikori of Japan serves to Stan Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Vincent Thian) (credit:ASSOCIATED PRESS)
Australian Open Tennis(20 of20)
Open Image ModalKei Nishikori of Japan Stan chases down a shot to Wawrinka of Switzerland during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 28, 2015. (AP Photo/Andy Brownbill) (credit:ASSOCIATED PRESS)