A tip-in by Keon Ambrose-Hylton with 3.1 seconds left lifted SMU to a dramatic 77-75 victory over Syracuse on Tuesday night in Dallas.With SMU (22-8, 13-6 ACC) holding possession and the score knotted at 75-all, Boopie Miller drove inside for a jumper that ended up off the mark with less than six seconds left. Ambrose-Hylton positioned himself for the offensive rebound and tipped the ball back off the glass and in.J.J. Starling missed a desperation 3-pointer at the final buzzer for Syracuse (12-18, 6-13), which has lost five of its last six.The Mustangs didn’t lead in the second half until the 46-second mark, when Miller found Ambrose-Hylton for a go-ahead layup and a 75-74 lead. Syracuse’s Jaquan Carlos made a free throw with 27 seconds left, tying the score and setting up SMU’s game-winner.Kario Oquendo had a game-high 16 points off the bench and Chuck Harris added 13 points for the Mustangs, who kept their NCAA Tournament hopes alive. Ambrose-Hylton finished with 12 points and Miller added 11. SMU shot 53.6 percent from the field, including 60.7 percent in the second half.