Matzek was optioned to Triple-A Albuquerque on Friday, Nick Groke of The Denver Post reports. Matzek walked 15 batters over 12 innings in his last three starts, so this doesn't come as a surprise. He probably needs some time to work things out in the minors, but the lefty could easily re-emerge as a rotation option for the Rockies, as the team isn't exactly flush with attractive alternatives.