BOSTON -- All-Star? Celtics?point guard Isaiah Thomas aggravated a hip injury in the first half of Friday's Game 2 loss to the Cleveland Cavaliers, sat out the second half, and is uncertain for Sunday's Game 3. Boston coach Brad Stevens said Thomas originally aggravated a nagging right hip injury during Game 6 last Friday in the second-round series against the Washington Wizards?and underwent a batch of testing before playing in Boston's Game 7 win Monday night. Thomas seemed to aggravate the injury again in the first half Friday against the Cavs and could be seen limping late in the second quarter. With Boston down 41 at halftime, Thomas was ruled out for the remainder of the game.? "I thought he looked much different in the first half," Stevens said. "When we went back to the locker room, our training staff and doctors got with him. He was pretty despondent not to be able to play. That guy is a tough guy and he plays through a lot. For him to...