Philipp Kohlschreiber Pictures
LONDON, ENGLAND - JULY 04: Gilles Muller of Luxembourg returns against Philipp Kohlschreiber of Germay during their Men's Singles second round match on day three of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 4, 2018 in London, England. (Photo by Michael Steele/Getty Images)