Roger Federer of Switzerland plays a forehand 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&#39;s timeless and elegant sense of style.