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.
Tyler Matzek walked six batters over five decisions in a no-decision as the Rockies lost to the Padres on Tuesday.
Tyler Matzek fired six innings of one-run ball in a Wednesday victory against the Giants.
Tyler Matzek pitched decently in his season debut against the Cubs on Friday, but was unable to make it through five innings to earn a victory.
Tyler Matzek wasn't at his best in Tuesday's Cactus League tuneup against the Giants, allowing two runs on four hits over his four frames.
Tyler Matzek gave up two runs in 3 1/3 innings in Wednesday's start versus the Padres.
Tyler Matzek was brilliant in Friday's Cactus League start against the White Sox, allowing just one hit and a walk over three shutout innings.