Ryan Harrison Pictures

  • LONDON, ENGLAND - NOVEMBER 16: Ryan Harrison (R) of the United States and Michael Venus of New Zealand in action in the Doubles match against Jean-Julien Rojer of Netherlands and Horia Tecau of Romania during day five of the Nitto ATP World Tour Finals at O2 Arena on November 16, 2017 in London, England. (Photo by Clive Brunskill/Getty Images)