Roger Federer v Mischa Zverev - Mercedes Cup Stuttgart

STUTTGART, GERMANY - JUNE 13: Roger Federer of Switzerland serves the ball to Mischa Zverev of Germany during day 3 of the Mercedes Cup at Tennisclub Weissenhof on June 13, 2018 in Stuttgart, Germany. Roger Federer debuts his new Wilson Pro Staff RF 97 Autograph racket at the 2018 Mercedes Cup in Stuttgart. The white and black design of the racket was inspired by the classic tuxedo, or dinner suit, and Federer's timeless and elegant sense of style. (Photo by Alex Grimm/Getty Images For Wilson Sporting Goods)