Only twice in the history of the Major Leagues have two no-hitters been thrown on the same day. The first instance occurred May 2, 1917, when Reds right-hander Fred Toney and Cubs left-hander Hippo Vaughn accomplished the feat. The other day involved A's righty Dave Stewart and Dodgers southpaw Fernando Valenzuela, who hurled no-hitters 27 years ago Thursday.