 He was 13–5 as a rookie, but lost Game 3 of the World Series against the New York Yankees as the Reds were swept.Thompson was a member of the Reds team that won the 1940 World Series against the Detroit Tigers, achieving a 16–9 record in the regular season although he was ineffective in his only Series start in Game 5.He played for the Giants in 1947–48, posting an 8–8 record.