The right-hander allowed six runs and lasted just 3 2/3 innings, his third disappointing start since coming off the 15-day disabled list after he was struck in the face on April 28 by a line drive off the bat of Carlos Gonzalez.
In those three starts, he has allowed 14 runs in 10 2/3 innings. In the three starts before the injury, Bradley had a 1.45 ERA, but he insisted that it's not a factor.
"No, the injury is past," said Bradley, who is ranked as the D-backs' top prospect. "It's just bad baseball, it's bad pitching, it's bad pitches, it's bad sequences, it's just everything is not good right now and I know that.