BOSTON — Paul Pierce overcame a miserable shooting game with a key jumper in overtime and Rajon Rondo finished with a triple-double with 20 assists, 10 points and 10 rebounds to lift the surging Boston Celtics to an 88-86 win over the Atlanta Hawks on Wednesday night. Kevin Garnett had 22 points and grabbed 12 boards before fouling out with just under 3 minutes left in OT, and Brandon Bass, who also hit a jumper in OT, scored 21 points. It was Rondo's 19th straight game with double digits in assists.