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08/22/2012 1:35 PM EST

Oakland's Colon suspended

The Office of the Commissioner of Baseball announced today that Oakland Athletics pitcher Bartolo Colon has received a 50-game suspension without pay after testing positive for Testosterone, a performance-enhancing substance in violation of Major League Baseball’s Joint Drug Prevention and Treatment Program.

The suspension of Colon is effective immediately.

This story was not subject to the approval of Major League Baseball or its clubs.