Giants pitcher Luis Custodio and free agent pitcher Luis Sierra were suspended 56 games each following positive tests under the minor league drug program.
Former big league outfielder Nate Schierholtz was suspended for 80 games Friday following a positive test for a performance-enhancing substance under baseball's minor league drug program.
Six minor leaguers have been suspended for 25 games each on the eve of the Dominican Summer League openers, including five from the New York Yankees organization.
Free-agent catcher Taylor Teagarden, who admitted to taking PEDs in an Al-Jazeera America documentary after last season, was suspended 80 games by Major League Baseball.
Three minor league pitchers, including Giants right-hander Dylan Brooks, have been suspended under baseball's minor league drug program.
