American Football League playoffs

For its first nine seasons, 1960 through 1968, the American Football League determined its champion via a single playoff game between the winners of its two divisions (although ties in the standings in 1963 (Eastern) and 1968 (Western) required a tiebreaker divisional playoff game the week before). In 1969, the tenth and final year of the independent ten-team AFL, a four-team playoff was held, with the second-place teams in each division traveling to play the winner of the other division in what were called the "Interdivisional" playoffs.

Source: Wikipedia — American Football League playoffs (CC BY-SA 4.0)