Jeter Martinez

Organization Prospect Rankings

• 
  Ranked Seattle Mariners #16 prospect in 2025
  BA Grade/Risk: 50/Extreme.
  
  Track Record: The Mariners signed Martinez for $600,000 in 2023, giving him the largest bonus for any prospect from Mexico in that signing class. He dominated the Dominican Summer League in his pro debut and followed that up with a decent 2024 season in the Arizona Complex League, albeit one littered with control issues.
  
  Scouting Report: The appeal for Martinez begins with projectability. He’s 6-foot-4, athletic and has the room to add muscle, and his fastball already sits in the mid 90s and has touched as high as 99 mph. Martinez also shows the ability to manipulate the baseball, mixing in a two-seamer when he needs a ground ball. His slider shows good shape, but he struggles to locate it. His changeup will also flash solid armside run but lacks consistency and command. The bugaboo for Martinez remains his inability to pitch backwards or stay in the zone often enough. His control was fine for the DSL, and there are other scouting indicators that his control should improve in the future, but it remains the main roadblock to a future as a long-term starter. He walked nearly 17% of ACL batters in 2024.
  
  The Future: Martinez has all of the ingredients to be at least a mid-rotation starter if he can rein in the walks. He is still incredibly young, ultra projectable and has the makings of three average or better offerings. There is a chance that he remains in extended spring training to spend extra time with player development, but he will likely be looking to make his full-season debut at some point in 2025.
  
  Scouting Grades: Fastball: 60 | Slider: 55 | Changeup: 50 | Control: 45.
• 
  Ranked Seattle Mariners #26 prospect in 2024
  BA Grade: 45/Extreme
  
  Track Record: Martinez originally developed as a position player in Mexico before converting to pitching when he was 15. He took to pitching rapidly and emerged as one of the most intriguing righthanders in the 2023 international class, leading the Mariners to sign him for $600,000 when the signing period opened. Martinez made his pro debut in the Dominican Summer League after signing, and starred as one of the league’s top pitchers. He led the DSL with a 0.79 WHIP and .109 opponent batting average among qualified pitchers, and finished fifth with a 1.72 ERA.
  
  Scouting Report: Martinez is a broad-shouldered righthander with a projectable 6-foot-4, 180-pound frame. His heavy fastball sits 92-93 mph and reaches the mid 90s out of a quick arm and easy, athletic delivery. His velocity has already increased rapidly in a short time and should continue ticking up as he fills out. Martinez shows aptitude for throwing a curveball and changeup, but both are raw due to his lack of pitching experience. His athleticism and easy delivery should yield at least average control as he gains strength.
  
  The Future: Martinez is as projectable as any pitcher in the Mariners system, but he has years of development left. He’ll make his stateside debut in the Arizona Complex League in 2024.
  
  Scouting Grades Fastball: 60 | Slider: 40 | Changeup: 40 | Control: 50