No Major League hurler had even hit double digits by the end of May since former Rays ace Victor Zambrano did it in 2004. However, his total stood at eight in mid-May.
No big league pitcher has hit 20 in a season since 2004, when former Cub Carlos Zambrano and Boston's Bronson Arroyo both did it to lead their respective leagues. Last season, the league-leading total was 14, reached by Ian Kennedy in the National League and Gavin Floyd in the American League.
Jason Beck is a reporter for MLB.com. Read Beck's Blog and follow him on Twitter @beckjason. This story was not subject to the approval of Major League Baseball or its clubs.