Bush also played in all seven games of the 1909 World Series against the Pittsburgh Pirates, becoming the surprise hitting star for Detroit. With Detroit stars Ty Cobb and Sam Crawford slumping in the World Series (batting .231 and .250 respectively), Bush hit .318 with an on-base percentage of .483. He also scored five runs, collected five bases on balls, was twice hit by a pitch, and compiled nine putouts, 18 assists, and three double plays (but also committed five errors).