In updating the Blue Jays' Top 30 rankings a few weeks back, MLB.com's Prospect Pipeline team graded No. 9 prospect Conner Greene's breaking pitch as a "below-average curveball."

After a week of work with pitching coach Vince Horsman, Greene is rewriting the scouting reports.

The right-hander added 7 mph to his breaking pitch in the past week and deployed it as a swing-and-miss offering Thursday. That led to a career-high 10 strikeouts en route to Class A Advanced Dunedin's 3-1 win over Daytona. He allowed an unearned run on two hits without issuing a walk.

Greene (2-3) described his breaking ball as a "loopy, very slow" offering that used to register around 74 mph until Horsman last week instructed him to add some zip to the pitch. Greene toyed with a harder heater when he tossed six scoreless frames against Palm Beach on July 31, but the breaking pitch was a whole new offering Thursday, registering as high as 81 mph on the Blue Jays' gun.

"That's a good progression," Greene said. "That's actually probably what got me more strikeouts."

The 20-year-old has been a breakout performer this year while pitching largely off his fastball and changeup. He entered the game with a 2.73 ERA in six Florida State League starts, but had just 25 strikeouts in 33 innings.

He induced more swings-and-misses by working the quicker breaking ball off an elevated fastball.

"I've gotten into a lot of 0-2 foul-ball matches," he said. "But today, something just clicked and they weren't fouling the ball off as much. My curve, I was throwing it well for strikes 0-0 and not in strikeout counts, and then I could get swings on it for a strikeout, the curve and the fastball. I think everyone I struck out was either a low curve or a high fastball."

Greene said he thinks the curve now looks more like his fastball out of his hand, and that illusion was the difference for him Thursday.

"[Horsman] has been working with me to get it faster and more straight, more like a fastball," he said.

The California native recovered from the unusual first inning by pitching perfectly through the second, third and fourth innings, striking out two batters in the second and third frames.

The right-hander again retired the side in order in the fifth, even after allowing a leadoff single to Jeff Gelalich. Carlton Daal replaced Gelalich at first on a fielder's choice ground ball. After Brian O'Grady struck out, Daal was picked off first to end the frame.

Greene retired the final six batters in order, fanning four in the process, including a swinging strikeout of Taylor Sparks to end the seventh.

Greene has thrown 19 consecutive scoreless innings over his past three starts. He has a 35-to-8 strikeout-to-walk ratio in seven starts with Dunedin since a midseason promotion from Class A Lansing.