McMahon went 3-for-5 with a double, a grand slam and a second run scored in Friday's 10-7 win over the Rays.
The 29-year-old committed an error in a five-run top of the ninth inning that put Tampa Bay ahead 7-6, but McMahon atoned for it with a walkoff slam on a Jason Adam sweeper that caught too much of the plate. It was McMahon's first homer of 2024, but he's off to a blistering start, batting .414 (12-for-29) with three runs and six RBI through eight games -- numbers that are even more impressive considering that Friday was the Rockies' home opener.