He was originally temporarily replacing Joe Saunders, who went on the disabled list Saturday with a strained left shoulder. But with Daniel Hudson possibly looking at season-ending Tommy John surgery after Tuesday's start, Bauer could be on the mound in the big leagues for good.
Bauer will make his much-anticipated first start for the D-backs on Thursday, as the team looks to avoid a sweep at the hands of the Braves.
"He's excited, we're excited to have him, let's be honest," D-backs manager Kirk Gibson said. "It's a great challenge for Trevor, and he's up to it."
Bauer was the third overall pick in the 2011 First-Year Player Draft, and will become the first member of his Draft class to play in the Major Leagues. This year, he has struck out 116 batters in 93 innings, and has an ERA of 2.23 in 16 starts between Double-A Mobile and Reno.
"I think we feel that Trevor has progressed, and it's getting time for him to find out how he does against a little better competition," Gibson said. "It has to start sometime, and we've decided this is it."
With all the high expectations on Bauer, the D-backs are somewhat worried that too much pressure is being put on the young man's arm for a rookie.
"My worry is that people put too much expectation on the young kid right now," Gibson said. "It's all a process, you know. This game is a little different, the hitters are a little better, the game's going to be a little faster. All the things that we've worked on starting in Spring Training, he's going to be tested to see how good he is at dealing with them."
For the Braves, it'll be Jair Jurrjens taking the hill. In his first outing since returning from the DL last week, the 26-year-old defeated the Red Sox, 4-1, with 7 2/3 innings of one-run, three-hit ball.
"There's no words to describe how good I felt," Jurrjens said after the game.
Braves: Varvaro settles in
Having tried out veteran Livan Hernandez and rookie Cory Gearrin, the Braves have settled on Anthony Varvaro as the seventh member of their bullpen during the last couple weeks.
Since being recalled from Triple-A Gwinnett on June 13, Varvaro has appeared in four games. The right-hander has pitched 6 1/3 innings, striking out eight batters and walking four.
D-backs: Hudson has torn elbow ligament
Daniel Hudson was diagnosed Wednesday with a tear of the ulnar collateral ligament of his right elbow, and was placed on the 15-day disabled list, though he will almost certainly be out far longer than that.
The typical treatment for the injury is ligament replacement surgery -- Tommy John surgery as it's commonly known -- and the recovery from that surgery is typically 12 months.
Josh Collmenter will start in Hudson's place Sunday against the Brewers, while Patrick Corbin was recalled from Triple-A Reno to take Collmenter's spot in the bullpen.
Miguel Montero is 13-for-29 with nine RBIs in his last seven games, and has reached base safely in 16 straight.
Jason Heyward has a career-best 12-game hitting streak, and has hit safely in 20 of his last 24 games.