After batting .383 with 22 homers during the 1930 season, O'Doul was traded to the Brooklyn Robins (now the Los Angeles Dodgers). In 1932, he batted .368 for Brooklyn to win another league batting title. After a slow start in 1933, when he batted just .252 through 43 games, O'Doul was again traded, this time back to the Giants. He rallied to hit .306 the rest of the way that season, but played just one more year before ending his career in 1934.
O'Doul then returned to the Pacific Coast League as manager of the San Francisco Seals from 1937 to 1951, later managing several other teams in the circuit and becoming the most successful manager in PCL history. One of his outstanding accomplishments while managing the Seals was developing the young Joe DiMaggio, who went on to a Hall of Fame career with the New York Yankees. O'Doul refused to take credit for DiMaggio's success, saying "I was just smart enough to leave him alone."
O'Doul was instrumental in spreading baseball's popularity in Japan, serving as the sport's goodwill ambassador before and after World War II. The Tokyo Giants, sometimes considered "Japan's Baseball Team," were named by him in 1935 in honor of his longtime association with the New York Giants; the logo and uniform of the Giants in Japan strongly resemble their North American counterparts.
O'Doul was inducted into the San Francisco Bay Area Sports Hall of Fame in 1981 and the Japanese Baseball Hall of Fame in 2002. He has the highest career batting average of any player eligible for the National Baseball Hall of Fame who is not enshrined. His relatively short career as a full-time batter and the fact that his statistics were accumulated during a period of historically high offensive production in the major leagues are factors militating against his selection to the Hall of Fame.
Leutzinger, Richard. "Lefty O'Doul and the Development of Japanese Baseball". The National Pastime, no. 12 (1992), pp. 30–34. ISBN 0-910137-48-X.
Leutzinger, Richard. Lefty O’Doul, the Legend That Baseball Nearly Forgot: The Story of the Hall of Fame’s Missing Star. Carmel, Calif.: Carmel Bay Publishing Group, 1997. ISBN 1-883532-03-5.
Dobbins, Dick; Twichell, Jon (editor: Rochmis, Jon). Nuggets on the Diamond, Professional Baseball in the Bay Area from the Gold Rush to the Present. San Francisco, Calif.: Woodford Press, 1994. ISBN 0-942627-00-8; ISBN 0-942627-01-6.