He received news of the callup Sunday and was in Philadelphia for the D-backs' 3-2 come-from-behind victory Tuesday.
"It's awesome," Miley said. "Tonight's game was unreal with all the fans cheering and to be able to come back and win it late in the game. It's a great experience, coming into first place in the division."
That also means no grace period for Miley, who will be thrust right into the thick of a pennant race.
Added pressure to perform, right?
"Try to keep it away as much as possible, but I'm sure there will be some," he said.
MLB.com ranks Miley the D-backs' No. 6 prospect. He was named the organization's Minor League Pitcher of the Year in 2010 and was 4-1 with a 3.64 ERA in eight starts for the Aces this season. In his last outing on Saturday, he pitched his first career complete game, allowing one run on three hits with nine strikeouts and one walk.
"He had a good game last game," D-backs manager Kirk Gibson said. "Hopefully he'll have a better game his next start."
Gibson could have opted to pluck Zach Duke or Micah Owings from the bullpen to replace Marquis for the four to six weeks he's expected to miss. But both have an ERA above 7.00 in games in which they have started, and Gibson didn't want to tinker with a bullpen that's "in great shape" and been productive.
"We know he's got good stuff," Gibson said. "He threw a lot in Spring Training. He was kind of pitching for a spot, and we threw a lot at him with his moves and all the fundamental stuff. I think it was a good experience for him."
Marquis was placed on the 15-day disabled list with a fractured right fibula. He was hit by a liner off the bat of Angel Pagan in the third inning of Sunday's 5-3 victory against the Mets. Marquis pitched into the fourth before falling to the ground after hitting Josh Thole with an inside sinker.
Additionally, the D-backs designated right-handed pitcher Kevin Mulvey for assignment. Mulvey, 26, was 3-7 with a 6.98 ERA for the Aces.