sentences:  On December 9, 2011, the Diamondbacks traded Parker, Collin Cowgill and Ryan Cook to the Oakland Athletics for Trevor Cahill and Craig Breslow.After spending the early part of the 2012 season at the Triple-A level, Parker joined the Athletics' starting rotation in late April.On June 4, 2012, Parker no-hit the Texas Rangers for seven innings before surrendering a single to Michael Young to lead off the eighth.