Baby Ace Promotions: Jonathan Pettibone & Brody Colvin

One of the highly touted Baby Aces is set to debut on Monday for the IronPigs against Syracuse.  

Jonathan Pettibone, 22-year-old right hander, a supplemental third-round pick in 2008, is 9-7 with a 3.30 ERA in 19 starts at Reading. He has a 3.16 ERA in 13 starts, allowing more than two earned runs in only two of those starts, allowing only 70 hits in 85.1 innings with 14 walks and 61 strikeouts.

Baseball America ranks him as the Phillies' fourth-best prospect behind Trevor May, Jesse Biddle and catcher Sebastian Valle. According to BA, Pettibone has the "best command in the system" and of the Phillies' deep pitching prospects he is "the best to reach his ceiling," which BA projects as a mid-rotation starter.

Pettibone sent the following tweet out after he picked up his ninth win in Reading's 6-1 victory over Altoona:

Pettibone

Meanwhile, another one of those baby aces, Brody Colvin is replacing Jonathan Pettibone spot with the Reading Phillies after being promoted from Clearwater Threshers. And earlier in the week, Jarred Cosart, a former baby ace in the Philadelphia Phillies system who was traded to Houston last year in the Pence deal has been promoted to Triple A.

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