The following season, Cowens averaged 19.0 PPG, 15.7 RPG, 4.4 APG and 1.3 BPG while guiding the Celtics to a record of 56-26. Cowens was instrumental in bringing the Celtics into the playoffs, where they defeated the Buffalo Braves in six games and the New York Knicks in five. In the finals, the Celtics faced the top-seeded Milwaukee Bucks. The teams split the first six games, with each team winning at least once on their home court. This led to a decisive Game 7, where the Celtics faced the Bucks in Milwaukee. The Celtics prevailed thanks to a strong performance by Cowens, who recorded 28 points and 14 rebounds as the Celtics took their 12th NBA championship.