Summary:
Griffin Jax became one of the most complete relievers in MLB by getting into a velocity range that let his elite pitch shapes and rare command actually show up.

Before Training:
Jax always had plus shapes and strong command, but in 2022–2023, his fastball hovered in the 94–95 mph range—good, not special. That capped how far his sweeper and sequencing could take him, and he was mostly surviving on a single pitch.

What We Worked On:

• Effective Velocity Gains: Added ~2 mph when accounting for extension, moving him into a range where his arsenal could fully play
  
  

• Expanded Usage: Went from a one-pitch profile to commanding multiple offerings with conviction
  
  

• Execution at Velo: Maintained 60-grade command while throwing 70-grade shapes—an extremely rare combo for any reliever
  
  

Key Metrics:

• Effective FB Velo Gain (2022–24): +2 mph (adjusted for extension)
  
  

• K-BB% (2024): 20.2%
  
  

• Whiff Rate (2023–24): Top 10% among MLB relievers
  
  

• Projection Shift: 0.3 → 1.4 WAR — from average reliever to front-line bullpen arm
  
  

Reflection:
This wasn’t a reinvention—it was a recalibration. Once Jax reached a velocity window where his stuff could shine, everything else followed. He’s now one of the few relievers in the league who pairs elite movement with actual command across his entire arsenal. Teams don’t fill bullpens with arms like this—they build around them.

Videos / Content:

• 2023 Season Highlights

• Improvement Since Training