The Oakland Athletics made their second move of the week to fill in their injured starting rotation, calling up Guillermo Moscoso from the AAA Sacramento Rivercats. Moscoso will take Tyson Ross' spot in the pitching rotation while Ross rehabs his oblique strain. While Moscoso has made relief appearances at the big league level, he has never made a start, and gets to make his starting debut against Angels ace Dan Haren.
Moscoso made seven starts and eight total appearances for the Rivercats this season before being recalled. In total, Moscoso finished 3-2 with a 4.02 ERA. He's struck out 43 batters and walked 13 over 40 1/3 innings and will be looking to follow in the footsteps of Josh Outman. Although the A's lost, Outman put together a strong pitching performance in his big league return from Tommy John surgery.
Prior to joining the A's, Moscoso made 11 total appearances in 2009 and 2010 for the Texas Rangers. In those 11 big league appearances, Moscos has an ERA of 4.30, giving up seven earned runs in 14 2/3 innings. The A's acquired Moscoso from the Rangers this past January in exchange for Ryan Kelly.