Guyer kicked off Sunday's showcase when he led off the game with a triple off Mark Buehrle and scored the game's first run on Logan Forsythe's single.
Guyer got on base again in the third, when Buehrle hit him with one out to bring Mahtook to the plate. After taking the first pitch for a strike, Mahtook drove a home run to right-center field. The rookie's sixth home run of the season gave the Rays a 3-1 lead.
"He got me my first at-bat," Mahtook said.