The Padres have optioned Tuesday night spot starter Jesse Hahn to Double-A San Antonio and recalled infielder Jace Peterson from Triple-A El Paso.
Hahn proved unimpressive in his first major league start. He yielded four earned runs on six hits in 3 2/3 innings in taking the loss against Pittsburgh.
Peterson is in the starting lineup for the Wednesday night game against the same Pirates. He will play second base in place of the struggling Jedd Gyorko.