76ers–Celtics rivalry 76ers–Celtics rivalry The 76ers–Celtics rivalry is a National Basketball Association (NBA) rivalry between the Philadelphia 76ers and the Boston Celtics. The two teams have the most meetings in the NBA playoffs, playing each other in 21 series, with the Celtics winning 13 of them. The 76ers are considered to be the Celtics' second greatest rival, after the Los Angeles Lakers. The Syracuse Nationals and Boston Celtics played in the Eastern Division in the 1950s. The Nationals beat the Celtics in three straight playoff series in 1954, 1955, and 1956, winning the NBA Championship in 1955. After the 1956 season the
2010–11 Boston Celtics season Conference standings during the All-Star break. However, after center Kendrick Perkins, who was working his way back from a torn ACL in last year's Finals, was traded to the Oklahoma City Thunder mid-season, the Celtics then started to play mediocre basketball after the trade, winning just 15 of their final 27 games. Still, they managed a 56–26 record and enter the playoffs as the 3rd seed in the Eastern Conference. They swept the New York Knicks, in four games in the first round to advance to the Conference Semifinals where they faced the Miami Heat, the team the Celtics defeated