Duffey's average fastball velocity has jumped from 90.99 mph to 93.3 mph, while the spin rate on his fastball has increased from 2,177 RPMs to 2,404 RPMs, which ranks third on the team behind Ryan Pressly and Adalberto Mejia. Duffey's curveball is seeing the same change, going from 2,421 RPMs to 2,533 RPMs, which is also third on the team behind Pressly and Taylor Rogers.
"I think it's allowing me to attack more aggressively," Duffey said. "As a starter you had to try to set things up a little bit differently. But now I can go in there, and throw my best stuff without having to think about it.