2009–10 Boston Celtics season for the twenty-first time in franchise history. The Celtics made it back to the NBA Finals after a one-year hiatus and played against the defending NBA champion and their rival, the Los Angeles Lakers. In a rematch of the 2008 NBA Finals, in which the Celtics defeated the Lakers in six games to capture their seventeenth championship, the Celtics were defeated this time by the Lakers in seven games. 2009–10 Boston Celtics season The 2009–10 Boston Celtics season was the 64th season of the Boston Celtics in the National Basketball Association (NBA). The Celtics finished with a record of 50–32,
Original Celtics of owner Jim Furry for embezzling $190,000 from a New York business. Then, in early October, just a month before the ABL season was to get underway, the Celtics bolted to the newly organized National Basketball League. The new league operated solely in and around the metropolitan New York City, but despite its geographical limitations was stocked with some of the best players in the country. After pulling off a coup by signing the Original Celtics, the NBL brashly raided ABL rosters for additional players. The Brooklyn Arcadians were particularly hard hit, losing stars Red Conaty and Rody Cooney, while