Scouting Report

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Scouting grades: Fastball: 55 | Slider: 55 | Changeup: 50 | Control: 50 | Overall: 45 

Though potential first-round pick Noah Schultz was sidelined indefinitely by mononucleosis after his initial two-inning outing, scouts still had reason to flock to Oswego (Ill.) East HS. Izzi impressed at the World Wood Bat Association World Championship in October and showed top-three-rounds stuff in his first appearance of the spring. He has been a bit inconsistent since while pitching in cold early-season weather in the Midwest. 

Izzi has an extremely projectable 6-foot-3 frame and already can reach 97 mph with a four-seam fastball that sits in the low 90s and has modest life. His low-80s slider has good depth and can be a solid offering at its best, but devolves into a slurve when he doesn't stay on top of it. He shows feel for a low-80s changeup with fade that should improve as he uses it more often. 

Izzi has a loose arm and a clean delivery that allow him to provide strikes with relative ease. The Wichita State recruit should continue to get better as he gets stronger and it's easy to project him as a starter. His higher arm slot may be more conducive to a curveball than a slider in the long run. 

Scouting grades: Fastball: 55 | Slider: 50 | Changeup: 45 | Control: 45 | Overall: 45

Oswego East High School in Illinois may not seem like a factory for high-end arms, but it was in 2022. That’s where Noah Schultz -- now the top left-handed pitching prospect in the game after the White Sox took him in the first round of that Draft -- and Izzi were teammates. Izzi showed enough for the Mariners to take him in the fourth round, going over slot with $1.1 million to sign him away from his Wichita State commitment. It was a slow rollout for the right-hander, not pitching after signing and throwing just 18 1/3 innings in the Arizona Complex League in 2023. But the gloves came off in 2024 and Izzi threw well, topping 100 IP for full-season Modesto. After opening 2025 with an oblique injury, he came into his own by midsummer and was then dealt to the Diamondbacks as part of the Deadline deal for Josh Naylor.

Izzi is pitching at age 21 for the 2025 season, and the 6-foot-3 right-hander built a pretty good foundation to work from. His fastball typically sits at least 94 mph and can touch as high as 97 at times, and he does a very good job of separating his four-seamer up in the zone and his sinking two-seamer down. His low-80s sweeper has the chance to be a solid pitch that misses bats. He didn’t have a great feel for his changeup with Modesto.

Whether that necessitates a move to the bullpen remains to be seen, although there is some thought that because of his excellent separation between his two fastballs, he might be able to stay in a rotation without a changeup. His splits were near-even before the trade, and his control had shown steady improvement, aiding the belief that he should still get rotation looks with Arizona.

Scouting grades: Fastball: 55 | Slider: 50 | Changeup: 45 | Control: 40 | Overall: 40

Izzi was a high school teammate of Noah Schultz, now one of the best left-handed pitching prospects in the game after the White Sox took him in the first round of the 2022 Draft. Area scouts stuck around enough to see Izzi, who jumped on radars in his senior season, and it was the Mariners who went all-in, going over slot in the fourth round to sign the right-hander for $1.1 million. Knowing he'd be a bit of a project, the Mariners sent Izzi to make his pro debut in the Rookie-level Arizona Complex League in 2023 and greatly limited his workload. He advanced to full-season ball in 2024 and was making a solid step in the right direction.

The 6-foot-3 right-hander is just 20 and still has plenty of projection as he continues to fill out his frame. He sits around 94 mph with his fastball and touches as high as 97 with the pitch. He should eventually have an average low-80s slider with good depth, though his higher arm slot makes that choice of breaking balls a little more challenging. There's feel for a changeup as well, though it's behind the other two, with it being a future fringe-average offspeed offering.

Izzi still needs to work on repeating his delivery and finding the strike zone more consistently for him to have a chance to start long-term. It's too early to pull the plug on him fitting into a rotation, but his fastball and slider could add a few ticks if he's pitching in shorter stints out of the pen.

Scouting grades: Fastball: 55 | Slider: 55 | Changeup: 50 | Control: 45 | Overall: 40

Izzi wowed ahead of the 2022 Draft when area scouts attended one of his high school outings to see a teammate, which prompted the club to do more homework and eventually select the highly projectable righty in the fourth round for over-slot value at $1.1 million, enough to sign him away from his Wichita State commitment.

It’s more upside than floor with the youngster, who didn’t throw competitively the rest of the year after being drafted -- a by-design, health-related effort with the rest of Seattle’s high school pitching selections. He was among the many invited to the club’s high-performance camp, with the goal of putting on more weight and strength.

Beyond conditioning, it’s about throwing more strikes and being consistent, because he can already reach 97 mph with his four-seamer, while sitting in the low-90s with modest life. The heater gives him a far higher ceiling than most his age. His low-80s slider also has good depth and is a pitch he can build upon, though his higher arm slot might be more conducive to a curveball instead. The path to starting long term will require polishing those two pitches, but more so fortifying the changeup, which is still a bit off. 

Scouting grades: Fastball: 55 | Slider: 55 | Changeup: 50 | Control: 50 | Overall: 45 

While Noah Schultz, who went in the first round of the 2022 Draft to the White Sox, was sidelined by mononucleosis after his initial two-inning outing, Izzi gave scouts reason to flock to Oswego East HS (Ill.) this past spring. He showed off early-round stuff at at the World Wood Bat Association World Championship in October and in his first appearance this past spring, and while he was more inconsistent pitching in the cold Midwest weather, he showed enough for the Mariners to take him in the fourth round and give him an over-slot bonus of $1.1 million to sign him away from his Wichita State commitment. 

Izzi has an extremely projectable 6-foot-3 frame and already can reach 97 mph with a four-seam fastball that sits in the low 90s and has modest life. His low-80s slider has good depth and can be a solid offering at its best, but devolves into a slurve when he doesn't stay on top of it. He shows feel for a low-80s changeup with fade that should improve as he uses it more often. 

Izzi has a loose arm and a clean delivery that enable him to provide strikes with relative ease. He should continue to get better as he gets stronger and it's easy to project him as a starter. His higher arm slot may be more conducive to a curveball than a slider in the long run.

Awards

NWL Pitcher of the Week

Week	Team
09/07/2025

CAL Pitcher of the Week

Week	Team
06/02/2024

Transactions

Team	Date	Transaction
	07/29/2025	Hillsboro Hops activated RHP Ashton Izzi.
	07/25/2025	RHP Ashton Izzi assigned to Hillsboro Hops.
	07/24/2025	Arizona Diamondbacks traded 1B Josh Naylor to Seattle Mariners for LHP Brandyn Garcia and RHP Ashton Izzi.
	05/01/2025	RHP Ashton Izzi assigned to Everett AquaSox from Modesto Nuts.
	05/01/2025	Modesto Nuts activated RHP Ashton Izzi from the 7-day injured list.
	04/04/2025	Modesto Nuts placed RHP Ashton Izzi on the 7-day injured list.
	03/06/2025	activated RHP Ashton Izzi.
	03/06/2025	Seattle Mariners Prospects activated RHP Ashton Izzi.
	04/04/2024	RHP Ashton Izzi assigned to Modesto Nuts from ACL Mariners.
	04/04/2024	Modesto Nuts activated RHP Ashton Izzi.
	03/06/2023	RHP Ashton Izzi assigned to ACL Mariners from Mariners Organization.
	03/06/2023	ACL Mariners activated RHP Ashton Izzi.
	08/16/2022	RHP Ashton Izzi assigned to Mariners Organization.
	07/26/2022	Seattle Mariners signed RHP Ashton Izzi.
	06/11/2022	College Workout activated RHP Ashton Izzi.
	06/11/2022	RHP A.J. Izzi assigned to College Workout.