In 1944 Doerr led the league in slugging percentage. The same year, his .325 batting average was good enough to allow him to finish second in the league, two percentage points behind Lou Boudreau of the Cleveland Indians. He was named the AL's Most Valuable Player by The Sporting News, although he finished only seventh in voting for the AL MVP Award, being named on only 13 of 24 ballots and receiving nothing higher than a third-place vote.
Doerr was an offensive force for the Red Sox in as they won their first pennant since 1918, driving in 116 runs despite a .271 average, and finished third in the MVP vote (won by Williams). He hit .409 in the 1946 World Series loss to the St. Louis Cardinals, with a home run and three runs batted in. Williams referred to Doerr as "the silent captain of the Red Sox.
Doerr hit for the cycle twice in his career, on May 17, in a 12-8 loss to the St. Louis Browns in the second game of a doubleheader, and again on May 13, in a 19-6 win over the Chicago White Sox. In 1950 he led the league in triples with 11; on June 8 of that year, he hit three home runs in a 29-4 romp over the Browns.
Regarded as one of the top defensive second basemen of his era, with observers divided between him and Joe Gordon of the rival New York Yankees, Doerr set an American League record in by handling 414 chances in a row over 73 games without an error.
Doerr batted over .300 three times, with six seasons of at least 100 runs batted in. Never playing a game at a position other than second base, he retired at age 33 in September due to a back injury, having 8,028 plate appearances, 1,094 runs, 89 triples, 809 walks, 1,349 singles, 1,184 runs created, 693 extra base hits, 2,862 times on base, 115 sacrifice hits and nine All-Star Game selections. He had enjoyed tremendous success at Fenway Park, hitting .315 there with 145 home runs, compared to a .261 average and 78 HRs on the road.
Doerr became a scout for the Red Sox from 1957 to 1966, then was the team's first base coach from 1967 to 1969, including the 1967 World Series loss to the Cardinals, Boston's first pennant since 1946. He later became hitting coach for the expansion Toronto Blue Jays from 1977 to 1981.
Doerr was inducted into the Baseball Hall of Fame in 1986. He has lived in Oregon since the late 1930s, residing in the vicinity of Agness for much of his career before relocating to Junction City in the 1950s. His jersey number 1 was retired by the Red Sox on May 21, . Since then, Doerr has lived a relatively quiet lifestyle at his Junction City home. He makes annual trips to the Hall of Fame induction at Cooperstown, New York, and when home, regularly fishes large game fish. Doerr married Monica Terpin on October 24 1938, and they had one son; the union lasted 65 years until she died at age 88 on December 17 2003 after suffering a number of strokes. He has carried on his quiet life since then.
On July 29, , the Baseball Hall of Fame honored Doerr after the induction of Cal Ripken, Jr. and Tony Gwynn into the Hall. On August 2, , the Red Sox held "Bobby Doerr Day" at Fenway Park where he rode along the warning track in a car, threw out the first pitch, and gave a speech.
Upon the death of former New York Yankee Phil Rizzuto in August 2007, Doerr became the oldest living player in the Baseball Hall of Fame, although Lee MacPhail, a member for his contributions as an administrator, is older.