Marcus Stroman, the Blue Jays' No. 4 prospect according to MLB.com, tied a Double-A New Hampshire record Tuesday night by striking out 13 batters.
However, he did surrender three runs on six hits in 6 2/3 innings and New Hampshire took a 3-1 loss to New Britain.
Stroman struck out the final five batters he faced before being lifted for reliever Dustin Antolin with two outs in the seventh inning.
"To be honest, I felt pretty locked in from the beginning of my start," Stroman said. "The two pitches I had were my fastball and my slider when I needed it. Those were the two pitches that I worked off of today.
"I had two or three [strikeouts] on my change, a couple off slider and a couple off my fastball. It was a mix of those three pitches."
The 22-year-old right hander out of Duke University tied a record set by former Major Leaguer Gustavo Chacin.
Overall, Stroman is 4-2 with a 3.38 ERA in nine starts for the Fisher Cats.
Quinn Roberts is a reporter for MLB.com.