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The Diamondbacks promoted Trevor Bauer (age 21) from AA to AAA Reno on Friday, and Bauer was very impressive in his AAA debut. Facing the Oklahoma City Redhawks (Astros), Bauer pitched 8 strong innings, allowing 4 hits and 1 run, while walking just 1 and striking out 11. The 11/1 strikeout-to-walk ratio is a very good sign for Bauer, as he had occasionally struggled with his control at Mobile (4.8BB/9). The only run that Bauer allowed came on a solo home run by catcher Landon Powell in the 8th inning. Bauer and the Reno Aces got the 2-1 win when OF Adam Eaton threw out the tying run at the plate, and reliever Jonathan Albaladejo got the final out for his 7th save. Overall, Bauer dominated a strong RedHawks lineup, as the entire starting lineup has Major League experience. including top prospects like OF Fernando Martinez and IF Jimmy Paredes, as well as veteran hitters like Mike Hessman and Scott Moore. Bauer got through 8 innings with 113 pitches, of which 73 were strikes, and had at least one strikeout in 7 of his 8 innings.

Bauer was promoted after eight starts in Mobile, where he had gone 7-1 with a 1.68 ERA and 60K/26BB in 48.1 IP. In his eight starts, he had allowed zero runs in five of them. GM Kevin Towers said that he wanted to put Bauer in an environment where "he probably was facing a little better competition, a little more of a veteran hitter, [and a] smaller ballpark where it's going to be a little more difficult for him." In Reno, Bauer joins former Mobile teammate Charles Brewer (24, 12th Round pick in 2009), who had been promoted from Mobile three weeks earlier.

Moving up to AA to take Bauer's spot was 24-year old RHP Michael Bolsinger. Bolsinger, a 15th Round pick in the 2010 Draft, had pitched well for Class A Visalia, going 3-2 with a 2.37 ERA and an excellent 49K/13BB ratio in 38 IP. Bolsinger had a solid first start for Mobile, allowing just 1 ER in 6.2 IP while striking out 7 and walking 3. Eric Smith (23), a 2nd Round pick in 2009, has also been promoted to Mobile.

RHP Jeffrey Shields (22, 7th Round, 2010) was promoted from Low A South Bend to take the open roster spot for Visalia. Shields had been up and down this season, with an overall record of 0-5 with a 4.05 ERA and 24K/10BB in 46.2 IP. Shields had three outstanding starts in April, where he had allowed only 2 ER over 21 IP, but had followed that up with 17 ER over his next 21 IP, over four starts. Nevertheless, the organization felt that he was the most qualified of the South Bend starters to make the jump to the California League.