The Celtics  kicked off summer league play with an 85-77 victory over the Heat on Saturday in Orlando.
The game featured 22 lead changes and 12 ties before a 25-13 Boston run to close out the contest helped the Celtics  seal the victory.
Kelly Olynyk led the Celtics  with 20 points (8-of-17 shooting) and eight rebounds while forward Mike Moser contributed 17 points (6-of-11) in 24 minutes off the bench.
Celtics  rookie guard Marcus Smart struggled from the field (2-of-8), but made his presence felt across the stat sheet, finishing the day with 10 points, five rebounds, three assists and five steals.
Phil Pressey was solid as the team’s starting point guard, scoring nine points (3-of-9) while dishing out seven assists. Pressey also impressed many with a nasty crossover move  on Miami rookie point guard Shabazz Napier.
Forward James Ennis led the Heat with 17 points (5-of-11) and eight boards. It was a rough debut for Napier, who scored 12 points but off a horrible 20 percent shooting percentage from the field (3-of-15) while recording just two assists and eight turnovers.
Celtics  rookie guard James Young, taken with the 17th overall pick of the 2014 draft, did not play in Saturday’s game for precautionary reasons  after injuring his neck in a car accident a few weeks ago.