Mischa Zverev Pictures
HALLE, GERMANY - JUNE 22: Mischa Zverev of Germany returns the ball during the men's singles match against Roger Federer of Switzerland on Day 6 of the Gerry Weber Open 2017 at Gerry Weber Stadion on June 22, 2017 in Halle, Germany. (Photo by Joachim Sielski/Bongarts/Getty Images)