Locklear started at first base and went 1-for-3 with a walk, an RBI and a run scored in Sunday's 8-7 extra-inning win over St. Louis.
Locklear made his first appearance for Arizona in 2026, after he was called up Friday as a replacement for the injured Tommy Troy (shoulder). First base is wide open for the Diamondbacks, who rank 27th in average (.219) and last in OPS (.590) at the position.