Bush was hitting .204 as a position player for the Lake Elsinore Storm before the decision came to move him to the mound in June. He spent several weeks with the Storm under the tutelage of pitching coach Steve Webber before heading to Arizona where he began to see game action.
In just 7.1 innings, the right-hander fanned 16 while allowing just one run on five hits and two walks for the AZL Padres.
He was shut down several times but nothing indicated trouble with his elbow. Bush had a tender arm from not pitching and experienced some soreness.
The former number one overall draft pick will now have surgery on the arm and will lose a year of development time. With a fastball clocked as high as 98 MPH, most pitchers regain their velocity and some come back even stronger.