see more

HALLE, GERMANY - JUNE 25: Roger Federer of Suiss cheers during the men's singles match against Alexander Zverev of Germany on Day 9 of the Gerry Weber Open 2017 at Gerry Weber Stadium on June 25, 2017 in Halle, Germany. (Photo by Joachim Sielski/Bongarts/Getty Images)

HALLE, GERMANY - JUNE 25: Roger Federer of Suiss cheers during the men's singles match against Alexander Zverev of Germany on Day 9 of the Gerry Weber Open 2017 at Gerry Weber Stadium on June 25, 2017 in Halle, Germany. (Photo by Joachim Sielski/Bongarts/Getty Images)