On January 16, 2012, Moscoso was traded, along with fellow pitcher Josh Outman, to the Colorado Rockies for outfielder Seth Smith.
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On May 24, 2011, he was recalled to the Oakland Athletics to take the place in the rotation of Tyson Ross, who went on the DL with a strained left oblique.
Guillermo del Toro | Guillermo Dávila | Guillermo Arriaga | Victor Moscoso | Guillermo Vilas | Guillermo Kuitca | Guillermo Francella | Guillermo Estévez Boero | Guillermo Somoza | Guillermo Söhnlein | Guillermo José Garlatti | Guillermo Gómez-Peña | Guillermo Buitrago | San Guillermo Parish Church | Mireya Moscoso | José Guillermo Rodríguez | Gunnar Guillermo Nielsen | Guillermo Vecchio | Guillermo Thorndike | Guillermo Ruiz | Guillermo Rodríguez | Guillermo Rigondeaux | Guillermo Pérez Roldán | Guillermo Navarro | Guillermo Mota | Guillermo Meza | Guillermo Mendizábal | Guillermo Leaden | Guillermo Klein | Guillermo José Torres |