Zeller had just watched Gordon Hayward sink a 14-foot pull-up jumper over him with 1.7 seconds remaining to put the Jazz in front. Unfazed, Smart -- who had 7-foot-1 Rudy Gobert defending the inbounds pass -- lobbed the ball to Zeller, who calmly maneuvered in traffic and released it right before time expired to lift Boston to victory.
While Celtics players swarmed Zeller, coach Brad Stevens calmly walked to center court to hug former Butler standout Hayward. Jae Crowder followed to swarm Stevens, the architect of the final play.
Isaiah Thomas scored 19 of his game-high 21 points in the second half to propel Boston's offense. Crowder added 18 points in 33 minutes and started the second half for the Celtics.
• Olynyk's return: Second-year big man Kelly Olynyk returned after missing 18 straight games with a right ankle injury. He played seven first-half minutes, misfiring on all three shots he took, and went scoreless.
• Loose balls: With Olynyk back, the Celtics went 10 deep with their rotation, but condensed it to eight players in the second half. Luigi Datome, Phil Pressey and Gerald Wallace were healthy DNPs. ... Shavlik Randolph landed on the inactive list with Olynyk back. ... Tony Brothers, the ref who tossed Thomas from his Boston debut last month in Los Angeles, was one of the game officials. ... Avery Bradley missed a few first-half minutes while returning to the locker room with a left elbow contusion.
• What it means: The Celtics snapped a two-game losing streak and improved to 24-36. The Jazz fell to 24-36. Boston heads out on a three-game road trip starting Friday in New Orleans before a Florida back-to-back against the Magic and Heat.