HALLE, GERMANY - JUNE 21: Alexander Zverev of Germany plays a backhand in his match against David Goffin of Belgium during day 5 of the Noventi Open at Gerry Weber Stadium on June 21, 2019 in Halle, Germany. (Photo by Thomas F. Starke/Getty Images)
HALLE, GERMANY - JUNE 21: Alexander Zverev of Germany plays a backhand in his match against David Goffin of Belgium during day 5 of the Noventi Open at Gerry Weber Stadium on June 21, 2019 in Halle, Germany. (Photo by Thomas F. Starke/Getty Images)