Jack Sikma scored a season-high 34 points and Tom Chambers 24 as the Seattle SuperSonics overcame a 14-point deficit to defeat the Celtics, 107-97, in a National Basketball Association game in Boston last night.

Boston, losing at home for the second time in 20 games this season, fell out of a first-place tie with Philadelphia in the Atlantic Division.

Boston led by 45-31 with 6:47 left in the first half and by 61-51 at intermission. Seattle started the third period with a 20-8 run that put them ahead, 71-69. The score was tied at 75 to start the final quarter.

Larry Bird, who led Boston with 30 points, got his team's first seven points of the fourth period to give the Celtics an 82-79 edge with 10:21 left in the game. But field goals by John Sundvold and former Celtic Gerald Henderson gave the SuperSonics the lead for good with 8:22 left.

A free throw by Kevin McHale got the Celtics to 97-95 with 2:17 to play. But Sikma hit a field goal and two free throws to give Seattle a safe cushion with 1:26 left.

Seattle, which has won five of its last seven, got 18 points from Al Wood and 16 points and 15 assists from Henderson, making his first Boston Garden appearance since being traded in the preseason after a prolonged contract dispute with the Celtics.

"It was a sweet win," Henderson said. "I wanted to come in and play well."

"I don't mind if the shots don't fall, but we really didn't have an all-out effort," Boston Coach K.C. Jones said. "That concerns me, but that will be rectified."