Answer
The Kansas City Athletics traded Roger Maris to the New York Yankees in December 1966, in exchange for Steve Whitaker, Bud Daley, and $50,000. Maris had spent his entire career with the Athletics, and had led the American League in home runs in 1960 and 1961. He went on to break Babe Ruth's single-season home run record in 1961, hitting 61 home runs.