Oakland Athletics minor leaguer Larry Cobb, a backup outfielder for the Stockton Ports, has been suspended 50 games after testing positive for a performance-enhancing drug, it was announced Monday.

The 23-year-old Cobb tested positive for amphetamines in violation of the minor league drug program.

Cobb was batting .221 for Single-A Stockton with three homers and five RBI in 68 at-bats. He also had 25 at-bats with Triple-A Sacramento, hitting .240 in 10 games.