Frances Tiafoe (back) retires from 4th-round match in Cincinnati

(Photo credit: Aaron Doster-Imagn Images)

Tenth-seeded American Frances Tiafoe was forced to retire Wednesday due to a lower-back injury down 6-4, 3-1 while facing Denmark’s Holger Rune, the No. 7 seed, at the Cincinnati Open in Mason, Ohio.

Tiafoe…

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