The Grizzlies, the National Basketball Association's top defensive team, led by 11 late in the third quarter before the Pacers rebounded.
Ben Hansbrough spurred the charge with two consecutive three-pointers to open the fourth, propelling the Pacers to a 14-4 run that gave them the lead for good.
Paul George scored 21 points to lead Indiana, which outscored Memphis 28-16 in the final quarter.
Grizzlies big man Zach Randolph had 21 points and 15 rebounds with Rudy Gay adding 11 points but missing a potential tying three-pointer with five seconds remaining.
Indiana made six straight free throws in the final 30 seconds to seal the win, their fifth in six contests. (Reporting by Jahmal Corner in Los Angeles, editing by Gene Cherry)
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- Ben Hansbrough