After months and months of struggling with a knee injury, 22-year-old Jared Donaldson had to go under the knife. The American has played just four events in 2019 and his ranking has dropped to No. 236.

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He's had to deal a few stops and starts since the injury took him off the tour last summer. The former world No. 48 didn't play for more than six months from the Rogers Cup in August until Delray Beach in February.

His return date hasn't been announced.