Connor Mattison

Draft Prospects

• Ranked #46 prospect in 2026 draft
  School: Grand Canyon. Drafted: Never Drafted
  
  Age At Draft: 21.8
  
  Mattison has been the best arm for the Antelopes this year and has pitched his way to a 2.57 ERA with 49 strikeouts to just 11 walks across 36 innings. He has cemented himself as a weekend starter and recently fired the school’s first no-hitter in 49 years. Mattison relies heavily on his changeup—a pitch he throws 56% of the time—and for good reason. It is a plus-plus pitch due to both the separation it gets off his fastball—nearly 14 mph—and its movement profile. Mattison throws it with conviction and will use it against both left and righthanded hitters. It seemingly falls off a cliff as it crosses home plate, which leads to plenty of swing-and-miss. Mattison could signal the pitch is coming and hitters still wouldn’t be able to touch it, that’s how good it is. He pitches in the low 90s with his fastball, and it will sometimes flash run to the arm side. Mattison throws his breaking ball sparingly and it would be nice to see it turn into a viable third pitch. He has a high-effort delivery with a long arm stroke, plenty of arm speed and a little bit of a head whack. Mattison embodies what it’s like to be in "attack mode" to a tee. His mound presence is outstanding and he pitches with a huge chip on his shoulder. Mattison has top-three round upside in 2026.
• Ranked #443 prospect in 2023 draft
  School: Canyon View HS, Waddell, Ariz. Source: HS
  
  Commit/Drafted: Grand Canyon
  Age At Draft: 18.8
  Mattison is a 6-foot-2, 205-pound righthander who has flashed some exciting pure stuff, but also has a few delivery questions. He’s a high-effort thrower who features a bit of head whack and a fall off to the first base side in his finish, and there’s also a ton of length and a bit of inversion in the back of his arm stroke. While the delivery could use some refinement, Mattison has thrown a fastball in the 89-92 mph range that has touched 93-94 at times, with solid arm-side ride. He’s thrown multiple breaking ball variants, with a top-down curveball and a slider with more horizontal movement, but both pitches need more power and consistency—though both flash impressive spin at times. His best secondary currently is a changeup in the upper 70s that has tons of fading action and potentially plays up thanks to the violence in Mattison’s delivery, as well as the velocity separation between his fastball. Mattison is committed to Grand Canyon.