AUBURN HILLS, Mich.—Tony Allen scored most of his 23 points in the pivotal second quarter, foiling Allen Iverson’s home debut with the Detroit Pistons and helping the Boston Celtics to an 88-76 win on Sunday.

Iverson was given a standing ovation when he was introduced for the first time as a Piston at The Palace, the frenzied fans so loud the public-address announcer couldn’t be heard.

A sold-out crowd stayed in the game during a closely contested first quarter before being quieted in the second, when Boston used four reserves to outscore Detroit 30-10.

The ...

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