Ben Shelton was in tears walking off the court Friday at the US Open. Unfortunately for the world's No. 6 player and second highest-rated American behind Taylor Fritz, he had no choice but to retire ahead of the fifth set against Adrian Mannarino -- an unexpected withdrawal after a shoulder injury.

For the first time in 178 career professional matches, Shelton had to stop play.

"Usually, I'll play through anything and just find a way," Shelton said after the match. "And whether it's sickness or injury, if I can stay out there, I can stay out there. I've never felt anything like this before, so that was kind of tough, I guess the uncertainty."

Known for his powerful serve, the 22-year-old lefty began to slice most of his offensive shots in the fourth set after the injury and was visi

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