Kyrie Irving, last season's Rookie of the Year, snapped out of his preseason shooting slump with 22 points for the Cavaliers (3-2), who came from behind after blowing a 14-point third-quarter lead.
Glen Davis scored 27 points to lead Orlando (0-3).
Irving shot just .239 (11 of 46) from the field in Cleveland's first four preseason games, but he scored nine straight to spark a 21-6 run that put the Cavaliers ahead 31-19 with 29.6 seconds left in the first half. He finished the first quarter with 11 points and the first half with 18, two more than his previous preseason single-game high of 16.
He finished an efficient 5 for 8 from the field and 11 for 11 on free throws.
General manager Danny Ainge says shoulder surgery is an option for Kelly Olynyk; the Celtics plan to bring Isaiah Thomas to the draft lottery.
Tracy McGrady believes Kyle Lowry's postseason struggles are all mental and says Raptors coach Dwane Casey should consider giving Cory Joseph more playing time.
Armed with high-value draft picks, low-cost young talent and salary-cap flexibility, there's potential for the Celtics to sign a true impact player.