HALLE, GERMANY - JUNE 15: Dominik Koepfer of Germany plays a backhand in his match against Alexander Zverev of Germany during day 4 of the Noventi Open at OWL-Arena on June 15, 2021 in Halle, Germany. (Photo by Thomas F. Starke/Getty Images)
HALLE, GERMANY - JUNE 15: Dominik Koepfer of Germany plays a backhand in his match against Alexander Zverev of Germany during day 4 of the Noventi Open at OWL-Arena on June 15, 2021 in Halle, Germany. (Photo by Thomas F. Starke/Getty Images)