Rusin's next scheduled start has been pushed back to Sunday, Thomas Harding of MLB.com reports.
Eddie Butler will replace Rusin as the starter for Saturday's matchup. The Rockies endured consecutive poor starts earlier in the week, which resulted in Rusin being made available for relief Thursday. He then had to push his side session back to Friday. After giving up just three runs through 16 innings in April, Rusin has struggled in May to the tune of a 5.66 ERA.