Cleveland's first regular-season game took place September 6, 1946 at Cleveland Municipal Stadium against the Miami Seahawks before a then-record crowd of 60,135. That contest, which the Browns won 44–0, kicked off an era of dominance. With Brown at the helm, the team won all four of the AAFC's championships from 1946 until its dissolution in 1949, amassing a record of 52 wins, four losses and three ties. This included the 1948 season, in which the Browns became the first unbeaten and untied team in professional football history. The Browns had few worthy rivals among the AAFC's eight teams, but the New York Yankees and San Francisco 49ers were their closest competition.