A great start turned into a big learning experience for the young Celtics  in a Summer League lesson handed out by the Pacers Monday in Orlando.
The Green went up by 18 points early against the Pacers in their second game of Summer League action on Monday. Then they got absolutely throttled by Indiana. Boston ended up losing the game by 19 points, 96-77.
The 37-point turnaround was as ugly as it sounds. The Celtics  shot a mere 34.3 percent (24-for-70) from the field, and only 25.9 percent (7-for-27) from beyond the arc.
Basketball is a game of runs. The Celtics  never responded to the Pacers’ run, which seemingly lasted three quarters.
‘That response has to happen on the defensive end of the court,’ Summer League head coach Jay Larranaga told reporters. ‘We were late on everything and we fouled too much.’
Kelly Olynyk led the team in scoring for the second straight game with 15 points (5-for-13 shooting) to go along with six rebounds and four assists. Meanwhile, Marcus Smart ‘ the No. 6 overall pick in the draft ‘ had another shaky game. Smart shot just 3-for-15 from the field, finishing with 11 points in 27 minutes.
Shooting remains a huge concern for Smart. But he was also unable to fill out the stat sheet like he did on Saturday against the Heat. Smart only had three boards, four assists and a steal to follow-up his debut.
Smart looked lost at times, settling for bad shots while looking less energetic on the defensive side of the ball (although, the same can be said about the entire team during the last three quarters).
James Young sat out yet again with a neck injury from a June car accident. His status is still up in the air as to whether or not he will play in Summer League.
Willie Reed led the way for the Pacers. He scored 18 points (8-for-12) while adding six rebounds, three assists and blocking four shots. It’s just Summer League, but if Willie Reed is drawing comparisons to Willis Reed , it’s not a good thing.
The Celtics will look to bounce back on Wednesday against the Pistons at 7 P.M.
Follow Julian Edlow on Twitter @julianedlow