Nationals manager Matt Williams said that outfielder Bryce Harper underwent successful thumb surgery Tuesday, the Washington Post reports.
Harper's return should come in six to eight weeks, with Williams adding, "We're optimistic."
Harper suffered a UCL tear in his thumb during a head-first slide into third base while legging out a triple Saturday. He has hit .289/.352/.422 with one home run and nine RBI in 83 at-bats.