Sam Querrey cut his right forearm in a freak accident after practicing for the Thailand Open in Bangkok and will be out at least four to six weeks, the U.S. Tennis Association says.

USTA spokesman Tim Curry says the 21-year-old Querrey sat on a glass table after practice on Monday and fell through, hurting his arm. The injury required emergency surgery.

Querrey is No. 25 in the ATP rankings.

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