HALLE, GERMANY - JUNE 17: Sebastian Korda of the United States serves in his match against Kei Nishikori of Japan during day 6 of the Noventi Open at OWL-Arena on June 17, 2021 in Halle, Germany. (Photo by Thomas F. Starke/Getty Images)
HALLE, GERMANY - JUNE 17: Sebastian Korda of the United States serves in his match against Kei Nishikori of Japan during day 6 of the Noventi Open at OWL-Arena on June 17, 2021 in Halle, Germany. (Photo by Thomas F. Starke/Getty Images)