The right-handed D-backs prospect improved to 4-0 while moving into a tie with Alex Cobb (Rays) for the circuit lead in strikeouts with 30. He threw 42 of his 55 pitches for strikes and didn't issue a walk in the Scorpions' 6-0 shutout of the Mesa Solar Sox.
Collmenter went 14-6 with a 3.38 ERA, 133 strikeouts and 51 walks in 152 innings across three levels of the Minor Leagues this season, spending most of his time at Double-A Mobile.
In seven Arizona starts, the Central Michigan University product allowed 10 runs -- nine earned -- on 25 hits and seven walks in 26 2/3 innings for a 3.04 ERA. He was tagged for one lone home run.
Collmenter was followed by five relievers, who allowed only two more hits Wednesday. Three Rockies pitchers handled middle relief -- Rex Brothers gave up a hit, but struck out three in the fifth, Bruce Billings struck out two in a perfect sixth and Adam Jorgenson walked one in the seventh. Adam Carr (Nationals) gave up the other Mesa hit in the eighth and Cole Kimball (Nationals) retired the side in order in the ninth.
Bryce Harper -- the top pick in this year's Draft by Washington -- doubled in a run and singled. Caleb Joseph (Orioles) added two hits and two runs.
Phillies prospect Tyson Brummett (1-1) suffered the loss after allowing two runs -- one earned -- on five hits in three innings.
Josh Harrison (Pirates), Kirk Nieuwenhuis (Mets) and Josh Satin (Mets) picked up the Solar Sox hits.
Paige Schector is an editor for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.