The Boston Celtics arrive in Houston with five straight wins, but they're on a back-to-back and their third game in four nights. The Rockets, meanwhile, have had two days off, so they're rested and ready to defend their undefeated home record. Records: Celtics 5-1 (1-1 road); Rockets 6-1 (3-0 home) Tip-off: 8:30 p.m.