BOSTON (AP) _ Paul Pierce showed no ill effects from being stabbed last month, scoring 28 points Wednesday night _ 20 in the first half _ to lead the Boston Celtics to a 103-83 victory over the Detroit Pistons.

Antoine Walker had 33 points and 12 rebounds as the Celtics improved to 3-1 in season openers in the Rick Pitino era.

One night after scoring a career-high 44 points in Detroit's season-opening victory at Toronto, Jerry Stackhouse scored 20 but shot just 7-of-21. The Pistons shot just 36 percent overall as they fell behind 56-40 at the half and got no closer than nine in the second half.

Pierce was stabbed nearly a dozen times on Sept. 25 at the Buzz Club, a nightclub in the Boston theater district. Pierce missed three preseason games recovering from what the Celtics described as ``injuries in an off-court incident.''

Pierce, who scored 14 points in 22 minutes in his first preseason game and averaged 16 points over the preseason, went to center court before the game and thanked the fans for their support, urging them to cheer loudly and promising the Celtics would give maximum effort.

``It's been difficult, but I'm back,'' he said.

And he didn't wait long, scoring 12 of his points in the second quarter. Walker had 12 in the first quarter and 21 by the half.

Notes: Boston's first-round draft pick, Jerome Moiso, made his NBA debut with 4:32 left in the first quarter. ... Walker left the game briefly after catching an elbow in the mouth. He got two stitches in his lip and returned. ... The Celtics raised a banner to honor Chuck Cooper, who was the first black player to be drafted into the NBA. The banner with Cooper's No. 11 will hang for the rest of the season.