Rakuten Open 2015 - Day 6

TOKYO, JAPAN - OCTOBER 10: Gilles Muller of Luzembourg competes against Stan Wawrinka of Switzerland during the men's singles semi final match on day six of Rakuten Open 2015 at Ariake Colosseum on October 10, 2015 in Tokyo, Japan. (Photo by Atsushi Tomura/Getty Images)