The AP reports: Gabe Pruitt banked in a 13-foot shot with 6.6 seconds left to give the NBA champion Boston Celtics a 90-89 exhibition victory over the Houston Rockets on Saturday night. Paul Pierce led Boston (2-1) with 15 points on 5-of-6 shooting from the field. Glen Davis had 12 points, Kevin Garnett and Leon Powe added 10 each, and Pruitt had eight. Yao Ming led Houston (2-1) with 16 points, Luis Scola added 14 and Ron Artest had 13.