American tennis stars Ben Shelton and Frances Tiafoe saw their U.S. Open runs end less than an hour apart Friday in New York, one by retirement and the other by a straight-sets trouncing.

Shelton fought through pain in his left shoulder throughout the fourth set of his match against Frenchman Adrian Mannarino, then retired before the fifth set could start. The No. 6 seed traded sets with his opponent 6-3, 3-6, 6-4, 4-6 up until that point.

Soon after, German qualifier Jan-Lennard Struff completed his second consecutive upset when he took down 17th seed Tiafoe 6-4, 6-3, 7-6 (7). Struff previously toppled No. 11 Holger Rune of Denmark in five sets and now heads to his first U.S. Open fourth round at 35 years old.

Shelton, whose injury was to his serving shoulder, had fired 11 aces and won

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