Jarrod Parker, 22, went 11-8 with a 3.79 ERA after missing the 2010 season due to Tommy John surgery. His command improved as he was further removed from the surgical procedure; Parker went 6-2 with a 2.84 ERA in the second half, walking 11 fewer batters than he did in the first half and not allowing a single homer. He helped the BayBears win the Southern League Championship by allowing just two runs in two starts during the postseason.
Post surgery, Parker's fastball still sits in the mid-90s. He doesn't throw his slider as often as he did before Tommy John, but it still grades out as a plus offering. His changeup has improved enough to give him a third plus-offering, and his curveball is pretty solid for a fourth pitch.
The D-backs' first pick in the 2007 draft and the ninth player taken overall, Parker will work with the relievers for the time being, manager Kirk Gibson indicated.
"We thought he was deserving to experience what we are going through," Gibson said of having Parker join the D-backs for the stretch run. "It's been a long road back for Jarrod."
Shortstop Tommy Manzella was designated for assignment by the Diamondbacks to clear a spot on the 40-man roster for Parker. Manzella, 28, was claimed off waivers from Houston in August. He hit a combined .232/.315/.351 with eight homers and 51 RBI in 131 Triple-A games this season for Oklahoma City and Reno. The D-backs would have had to add Parker to the 40-man roster over the winter anyway to protect him from the Rule 5 draft had they not made the move now.
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