MLB.com's No. 28 prospect struck out seven over five solid innings Tuesday before the Double-A Trenton Thunder defeated the New Hampshire Fisher Cats, 3-1.
Banuelos yielded one run on five hits and a walk but settled for his 11th no-decision in 15 starts. He did help Trenton beat New Hampshire for the fifth time in six meetings.
The only run the 20-year-old left-hander surrendered came in the fifth, when Adeiny Hechavarria -- the Blue Jays' No. 8 prospect -- hit a one-out homer to left-center field.
Signed as a non-drafted free agent in 2008, Banuelos had a 5.20 ERA in six starts this month. He posted a 1.56 ERA in April and a 2.59 mark in May.
Banuelos' worst starts of the year both came this month -- he was reached for five runs on nine hits over four innings on June 6 against Reading and yielded five runs on five hits in three innings on June 17 at Binghamton. Those outings are the only times this season he's given up more than three runs in a game.
The native of Mexico has looked better in his last two starts, however, allowing three runs on eight hits over 10 innings. He's also exhibited the type of control that has evaded him for most of the season, striking out 13 while walking only two. Before that, he issued at least three free passes in seven consecutive contests.
Overall, Banuelos is 3-1 with a 3.38 ERA and 69 strikeouts over 69 1/3 innings.
After he exited Tuesday, three relievers combined to scatter four hits over four scoreless innings. Switch-pitcher Pat Venditte (1-3) earned his first win of the season by tossing two shutout frames. After compiling a 7.71 ERA through his first 10 appearances, he's lowered that mark to 3.12 in 29 games.
Josh Romanski worked around a pair of hits in the eighth and Alan Horne, who missed the entire 2010 season, allowed a hit and a walk in the ninth before recording his first professional save.
Making a rehab start, New Hampshire's Jesse Litsch allowed one run over five innings and struck out six without issuing a walk. He's been on the Major League disabled list since May 19 with a right shoulder impingement.
Clint Everts (0-1) took the loss after allowing a run on three hits over two innings.