In , Allison went north with the Senators and he batted .261 with 30 home runs and 85 runs batted in; led the league in triples (9), was named to the All-Star team, received a smattering of MVP votes, and was honored by being voted Rookie of the Year. Allison experienced a "sophomore slump" in 1960 with an across-the-board drop in his offensive statistics. However, he came back strong in 1961, hitting 29 home runs and 105 RBI, although his batting average dropped for the second year in a row, to .245. When the Senators moved to Minnesota in , Allison became a local favorite and along with teammate Harmon Killebrew made one of the most dangerous one-two punches in baseball.