.233. Allison then spent 1957 and 1958 playing for the Chattanooga Lookouts of the AA Southern League and he raised batting average and slugging percentage to .307 and .446 respectively in 1958 (both highs in his minor league career). On September 16, 1958, Allison made his major league debut, batted lead-off, and got a single in four at-bats in a 5–1 loss to the Cleveland Indians. 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. In , Allison had 25 doubles, 35 home runs, 91 RBI, led the league in runs scored (99) and in OPS (.911), and earned his second All-Star berth. In addition, he became the first of four Twins to lead the league in WAR, a stat that measures a player's overall production both in the field and at the plate, (along with teammate Zoilo Versalles, Rod Carew, and Joe Mauer) and the only one not to win the MVP in the same season (finishing a distant 15th behind winner Elston Howard and behind teammates Camilo Pascual, Earl Battey, and Killebrew on the 1963 ballot). He followed this up in with a 32-home run 86 RBI performance that got him named to his third and final All-Star team, this time at first base. The next year, Allison suffered a broken left hand when he was hit by a pitch and missed 91 games, but returned at the end of the season to knock a pinch-hit three-run homer against the New York Yankees. During the Twins 1965 World Series season, Allison had a down year, hitting only .233 in 135 games, and continued his poor production versus the Los Angeles Dodgers, reaching base only 4 times (two walks, a double, and a home run) and striking