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WASHINGTON (AP) - Nationals outfielder Bryce Harper reportedly is going to be sidelined at least until July because of surgery on his left thumb.

ESPN.com says Harper will have the operation Tuesday.

The Nationals didn't immediately respond to a request for comment.

Washington put Harper on the 15-day disabled list Sunday, saying he had a sprained left thumb. He was hurt Friday night on a headfirst slide into third base on a triple against San Diego.

The 21-year-old Harper is a two-time All-Star. He is hitting .289 with one home run and nine RBIs this season.

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