The Los Gatos, California, native recorded the first NASCAR Cup Series victory for Kaulig Racing in the series' inaugural event at the Indianapolis Road Course.
Elliott started 34th after failing to post a qualifying time, but methodically worked his way into the lead, passing Matt DiBenedetto on Lap 38, and then overtaking Kyle Busch with 17 to go.
The Tucson, Arizona, native capitalized on teammate Kyle Larson's last-lap misfortune to claim his third victory of 2021 at the Tricky Triangle circuit.