Philadelphia's Christmas Day win over defending champion Boston is the latest in a string of performances that has turned around the 76ers' season and renewed their championship aspirations.
In a game that had a playoff feel, the Celtics made enough plays down the stretch for a 111-105 victory over the Bucks that gave them a 3-0 sweep of the season series.
With the knockout rounds of the NBA Cup all set, there will be a new champion as well as an almost entirely different field than last year's inaugural version. In again this year are the New York Knicks and Milwaukee Bucks, who registered wins on Tuesday.
Despite being without Joel Embiid, who is dealing with swelling in his left knee, the 76ers managed to end a five-game losing streak against the Nets behind another outstanding performance from self-proclaimed "rookie of the year" Jared McCain.