 The backcourt tandem of Dennis Johnson and Danny Ainge provided the third quarter spurt for the Celtics, combining for 22 points, while Boston held Houston to just 17 points in an expected victory.The third quarter again proved decisive for the Celtics, outscoring the Rockets 34-19 in the quarter.Sampson and Olajuwon combined for 32 points in the first half, but only seven in the second.