Rockies placed LHP Tyler Matzek on the 15-day disabled list with anxiety.
Tyler Matzek returned to Rockies camp Thursday.
Tyler Matzek has left Rockies camp in Arizona to deal with "personal issues."
Tyler Matzek was scratched from a scheduled appearance Sunday so that he could work on his mechanics.
Tyler Matzek was lit up for three earned runs without securing an out Wednesday versus the Diamondbacks.
Tyler Matzek has been sent home to take a mental break as he battles control issues.
Tyler Matzek will be held out of action for Triple-A Albuquerque indefinitely while he works on his mechanics.
Rockies optioned LHP Tyler Matzek to Triple-A Albuquerque.
Tyler Matzek allowed four earned runs in two innings Wednesday as the Rockies dropped the first half of a doubleheader against the Diamondbacks.
Monday's game between the Diamondbacks and Rockies has been postponed due to rain.
Rockies manager Walt Weiss expects Tyler Matzek (hamstring) to make his next start.
Tyler Matzek improved to 2-0 after limiting the Diamondbacks to two runs over five innings on Monday.
Tyler Matzek had to leave Monday's outing versus the Diamondbacks with a left hamstring cramp.
Tyler Matzek exited Monday's start against the Diamondbacks with an apparent injury.