Santana was seen taking a swing at a fan from the visitors' bullpen at Detroit's Comerica Park during the second game of a doubleheader on Thursday.

Pittsburgh Pirates reliever Dennis Santana was suspended four games and fined by MLB for his altercation with a fan in Detroit.

Santana enters Friday having appeared in 32 games this season, his first full campaign with Pittsburgh. He's amassed a 1.72 ERA (246 ERA+) and a 5.00 strikeout-to-walk ratio to date, making him a valued member of the Pirates bullpen.