Alexander Zverev of Germany holds his trophy after winning the St. Petersburg Open ATP tennis tournament final match against Stan Wawrinka of Switzerland in St. Petersburg, Russia, September 25, 2016. (Photo by Igor Russak/NurPhoto via Getty Images)
Alexander Zverev of Germany holds his trophy after winning the St. Petersburg Open ATP tennis tournament final match against Stan Wawrinka of Switzerland in St. Petersburg, Russia, September 25, 2016. (Photo by Igor Russak/NurPhoto via Getty Images)