Mayers allowed one run on one hit across one inning Sunday in the Cardinals' loss to the Diamondbacks.
The 26-year-old gave up a solo home run in the eighth inning, which allowed Arizona to boost its lead late in the game. The right-hander figures to see more action this year, as the Cardinals struggle with a banged up bullpen. Mayers has been knocked around at the big-league level in just eight career appearances, accruing a 18.00 ERA.