McMahon went 1-for-4 with a solo home run in Wednesday's 7-4 loss to the Tigers.
The Rockies were in a 6-0 hole after the first inning, but McMahon got them on the board in the top of the second by taking Casey Mize deep. McMahon has emerged from his post-All-Star break malaise, and over his last 16 games he's slashing a respectable .262/.328/.426 with three homers, four runs and six RBI. His next long ball will give the 29-year-old his fourth straight 20-homer campaign.