Matzek was promoted to Double-A Hartford on Friday, Patrick Saunders of the Denver Post reports.

EDGE Analysis

Matzek missed time earlier in the season due to some performance anxiety, but it seems that he's doing well enough to advance to the next stage of the minor leagues. The left-hander's 4.71 ERA wasn't very impressive during his time with High-A Modesto, especially for a reliever, so he'll have to figure some things out if he wants to get back up to the Triple-A level before the conclusion of the season.