He began his professional career with the Hagerstown Hubs of the Blue Ridge League in 1930. He set several all-time seasonal marks for the Blue Ridge League that year: at bats (466), hits (175), extra base hits (62) and total bases (300). He appeared briefly (3 games) at the major league level for the Washington Senators in 1931, but he did not stay permanently until he began playing with the Chicago Cubs in 1933.
He played 726 major league games in 11 seasons, batting .310 (657-for-2117) including 19 triples and 54 home runs, 345 RBI, a .362 on-base percentage, and a .472 slugging percentage. Phelps was named to the National League All-Star Team from 1938 to 1940, and helped the Dodgers win the 1941 National League pennant. He died in his hometown at the age of 84.
Johnson, Lloyd and Wolff, Miles, editors: Encyclopedia of Minor League Baseball. Durham, North Carolina Publisher: Baseball America, 2007. Format: Hardback, 767 pp. ISBN978-1-932391-17-6