Atlanta Braves right-hander Brandon McCarthy was pulled after hurting his left shoulder reaching to grab a throw while covering first base.
McCarthy left after recording the last out of the fifth inning of his start against the Washington Nationals on Wednesday.
McCarthy had what the Braves said was a subluxation of his non-throwing shoulder, which can refer to a partial dislocation.
He spent more than a month on the disabled list last season after dislocating his left shoulder with the Los Angeles Dodgers.
Wednesday's injury came when McCarthy stretched out his left arm to collect a toss from first baseman Freddie Freeman on a groundout by Brian Goodwin. McCarthy immediately grabbed at his shoulder and a trainer came out to attend to him.
He gave up one run and four hits against Washington. When he left, Atlanta led 2-1, but Washington tied it at 2 in the ninth against reliever Arodys Vizcaino.
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