Diamondbacks' Matt Peacock: Optioned to Triple-A

Peacock was optioned to Triple-A Reno on Friday.

Peacock owns an unimpressive 4.90 ERA in 86.1 innings as a swingman this season, with his strong 59.2 percent groundball rate not proving to be enough to offset a very low 13.0 percent strikeout rate. He'll make way on the roster for Humberto Castellanos, who was recalled to start Saturday against Seattle.