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05/18/12 6:22 PM ET

Minor Leaguer Muno suspended for PED use

TORONTO -- Major League Baseball has suspended Mets Minor League second baseman Daniel Muno 50 games for testing positive for a performance-enhancing substance, the league announced Friday.

Muno, 23, was batting .283 with five home runs and an .800 OPS in 38 games for Class A St. Lucie, holding his own in a notoriously difficult environment for hitters. He was coming off a breakout professional debut last summer, ranking 17th on MLB.com's Mets Prospect Watch after posting a .466 on-base percentage in 59 games with Class A Brooklyn.

Muno's suspension became effective immediately after the infielder tested positive for a metabolite of Drostanolone, a performance-enhancing substance.

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