The "M&M Boys" were the duo of New York Yankees baseball players Mickey Mantle and Roger Maris, who were teammates from 1960 to 1966. They gained prominence during the 1961 season, when Maris and Mantle, batting third and cleanup (fourth) in the Yankee lineup respectively, both challenged Babe Ruth's 34-year-old single-season record of 60 home runs. The home run lead would change hands between the two teammates numerous times throughout the summer and fueled intense scrutiny of the players by the press. Maris eventually broke the record when he hit his 61st home run on the final day of the season, while Mantle hit 54 before he was forced to pull out of the lineup in September because of an abscessed hip.

Roger Eugene Maris was an American professional baseball right fielder who played 12 seasons in Major League Baseball (MLB). He is best known for setting a new MLB single-season home run record with 61 home runs in 1961.