Celtics win wild one in OT after blowing 20-pt. lead to Lakers 1:17 AM ET Dave McMenaminESPN Staff Writer Close Lakers and NBA reporter for ESPN. Covered the Lakers and NBA for ESPNLosAngeles.com from 2009-14, the Cavaliers from 2014-18 for ESPN.com and the NBA for NBA.com from 2005-09. LOS ANGELES -- Another dramatic chapter was written in the long, storied history of the Los Angeles Lakers and Boston Celtics rivalry on Tuesday night. The Celtics won in overtime, 122-118, in a game Boston appeared to have no business losing, then no business winning after a wild comeback by L.A. Boston, led by Jayson Tatum 's 44 points on the night, outscored L.A. 12-8 in the extra period to pull out the win. The Lakers trailed the Celtics by as many as 20 points in the third quarter but used an 18-0 run through the end of the third to the beginning of the fourth to take control, going ahead by as many as 13 with 4:25 remaining in regulation. Editor's Picks The Celtics and Suns don't look like teams reeling from offseason chaos 7d Brian Windhorst 2 Related L.A. seemingly had a chance to ice it with Anthony Davis at the line with 28.0 seconds left and up by two, but Davis -- who was 11-for-13 on free throws on the night at the time -- missed them both. The misses set up a game-tying pull-up jumper by Tatum with 17.1 seconds remaining, and L.A. worked the clock down to get LeBron James a potential game winner at the buzzer, but James' 3-point attempt didn't go down. Much like in the Lakers' road loss in Philadelphia last week when L.A. surmounted a furious comeback to force overtime only to fall apart in the extra session, the Celtics broke the game open to close things out. Russell Westbrook (20 points, 14 rebounds, 5 assists, 4 blocks) scored the first four points in overtime to give L.A. a 114-110 lead, but the Lakers couldn't sustain the momentum. Davis finished with 37 points and 12 rebounds, and James had 33 points, 9 rebounds and 9 assists. The Celtics came into the night with an NBA-best 21-7 record, but had dropped two games in a row to the Golden State Warriors and LA Clippers . "That's a prideful group over there," Lakers coach Darvin Ham said before the game. "I wholeheartedly believe that they're not pleased at all. Not just with the Clippers loss, but with the loss before that against the Warriors. We know we're going have our hands full."