Celtics 100, Heat 98 (2OT): Paul Pierce notched his seventh career triple-double and buried the go-ahead jumper with 30.4 seconds to play as host Boston snapped a six-game losing streak.
Kevin Garnett had 24 points and 11 rebounds and Pierce collected 17 points, 13 rebounds and 10 assists as the Celtics snapped the Heat's four-game winning streak shortly after learning that All-Star point guard Rajon Rondo was lost for the season with a torn anterior cruciate ligament.
LeBron James scored 34 points and grabbed a season-high 16 rebounds and ex-Celtic Ray Allen scored 21 points in his first game at TD Garden since leaving Boston to sign with Miami in the offseason.
James, who hit a tying 3-pointer with seven seconds to go in regulation to force overtime, converted a three-point play with 62 seconds left in the second extra session for a 98-95 lead.
Jason Terry hit a pair of free throws before Pierce hit a pull-up jumper over James and the Celtics withstood a missed 3-point attempt by Shane Battier to halt a four-game skid at home.
GAME NOTEBOOK: Rondo, who leads the NBA in assists with 11.1 and had back-to-back triple-doubles in his last two games, was injured late in Friday's double-overtime loss in Atlanta. He went to New England Baptist Hospital on Sunday for an MRI exam that revealed the injury. ... The Celtics displayed a video tribute to Allen - who played five seasons in Boston - during the first timeout that was initially greeted with loud boos before the crowd gave him a standing ovation. ... Chris Bosh had 16 points and 16 rebounds and Dwyane Wade scored 17 for Miami, which fell to 10-10 on the road