Kei Nishikori of Japan reacts after defeating Philipp Kohlschreiber of Germany in the three sets of their fourth round match in the Louis Armstrong Stadium at the 2018 US Open Tennis Championships at the USTA Billie Jean King National Tennis Center in New York City on September 3, 2018. Nishikori won 6-3, 6-3, 7-5. Photo by Monika Graff/UPI