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ATP, Advanced Therapy and Performance
Jake Walkinshaw pitching

Pitcher · Miami Marlins organization

Jake Walkinshaw

Come back from UCL reconstruction, then build a professional career on an arm that holds.

Outcome

Back from UCL reconstruction in 11.5 months in college. Rebuilt again as a professional, more than once. Seven professional seasons, a 99 mph fastball, and an average still climbing at 29.

Surgery to NCAA competition
UCL reconstructionto11.5months
Average fastball at Triple-A2022 to 2026
92.6to96.0mph
Strikeout rate at Triple-A2025 to 2026
13.7%to24.4%

Where it started.

A Southern New Hampshire starter who tore his UCL midway through the 2017 season, had it reconstructed, and chose ATP for the rehab over a traditional physical therapy clinic. A surgeon's protocol with checkpoints to hit, and a college career he wanted back.

What they wanted

To be challenged through rehab by people who work with elite athletes every day, and to pitch in NCAA competition again without the arm becoming the story.

What ATP saw.

ATP evaluated 5 of the seven domains for this case. The lit circles are where the history sent us. Tap any circle to see what ATP looks at there.

Jake Walkinshaw pitching

Medical · Tissue · Capacity · Skill · RecoveryTap a circle to see what ATP looks at there.

In order.

What came first, and what came after.

  1. Priority 1: Protect the repair and hit every surgeon-prescribed checkpoint

  2. Priority 2: Rebuild the body behind the arm while the elbow healed

  3. Priority 3: Return to throwing on a progression, then keep building the engine every offseason

What we did.

The tools follow the diagnosis. Every item here was chosen after the priorities were set.

Interventions

  • Daily check-ins with Taylor Benson, with the plan adapted to how he felt while every surgeon checkpoint was still met
  • Strength, throwing and arm care under one roof, then an offseason program at ATP every year of his professional career

Testing

  • Surgeon-prescribed rehab checkpoints, every one hit

Format

  • On-site therapy and training in Stamford; offseasons at ATP through his professional career

What changed.

UCL reconstruction and rehab in 2017; NCAA competition 11.5 months later; professional baseball since 2019; Triple-A since 2022

  • 01Back on the mound for Southern New Hampshire 11.5 months after surgery, April 8, 2018, closing out a win against American International College; the dugout's celebration went viral
  • 026-1 with a 1.64 ERA the rest of that season; 7-2, a 2.01 ERA and 102 strikeouts in 98.2 innings as a starter in 2019
  • 03Drafted by the Oakland Athletics in June 2019
  • 04Triple-A by his third professional season, 2022
  • 05Clinched the 2025 Pacific Coast League championship for Las Vegas with a 99 mph sinker for the final strikeout
  • 06Signed with the Miami Marlins organization in February 2026; at Triple-A Jacksonville his fastball averaged 96.0 mph and his strikeout rate rose from 13.7 percent to 24.4 percent
  • 07His hardest fastballs have come after the later surgeries: a 99.1 mph four-seamer on September 19, 2025, a 99 mph sinker to clinch the Pacific Coast League five days later, and season averages that rose from 92.6 mph at Triple-A in 2022 to 96.0 in 2026

On the record

  1. 2014Seymour High School senior season9-2, 0.79 ERA, 79 strikeouts in 79 innings; Class S All-StateSNHU Athletics
  2. 2015Southern New Hampshire freshmanNortheast-10 All-Rookie Team; 1.74 ERA in 21 relief appearancesSNHU Athletics; Baseball-Reference
  3. 2016Sophomore season5-0, 1.79 ERA, 46 strikeouts in 40.1 inningsBaseball-Reference
  4. 2017UCL injury midway through the season; reconstruction; rehab at ATPPenmen Press; ATP-published testimonial
  5. 2018-04-08First game back, 11.5 months after surgery, closing a win against American International CollegeThe dugout's celebration passed 770,000 viewsPenmen Press, April 23, 2018
  6. 2018Rest of the return season6-1, 1.64 ERA, 0.81 WHIP in 13 gamesBaseball-Reference
  7. 2019Graduate season as a starter7-2, 2.01 ERA, 102 strikeouts in 98.2 innings, 14 startsBaseball-Reference
  8. 2019-06Drafted by the Oakland Athletics36th round, 1,094th overallBaseball-Reference
  9. 2019First professional season, Arizona League3.28 ERA, 29 strikeouts and 4 walks in 24.2 inningsBaseball-Reference
  10. 2021Stockton Ports, Single-A14 starts, 72.1 inningsBaseball-Reference
  11. 2022Lansing, High-A, to Las Vegas, Triple-A3.44 ERA in six Triple-A games; fastball averaging 92.6 mph, topping at 96.2Baseball-Reference; MLB pitch tracking
  12. 2024Midland, Double-A, and the Arizona Fall League2.15 ERA in eight Double-A games; fastball averaging 94.5 mph in the Fall LeagueBaseball-Reference; tjstats.ca
  13. 2025Las Vegas Aviators, Triple-A, as a reliever36 games; fastball averaging 95.6 mphBaseball-Reference; tjstats.ca
  14. 2025-09-19Hardest tracked pitch of his career99.1 mph four-seam fastball, and a 99.0 mph sinker the same night, Las VegasMLB pitch tracking (Statcast), game feed
  15. 2025-09-24Clinched the Pacific Coast League championshipA 99 mph sinker for the final strikeout of the series against TacomaMiLB.com video
  16. 2025-09-27Ninth inning of the Triple-A National Championship game against JacksonvilleLas Vegas Review-Journal
  17. 2026-02Signed with the Miami Marlins organization; assigned to Triple-A JacksonvilleMiLB.com transactions
  18. 2026Jacksonville Jumbo Shrimp, Triple-A34 games, 41 strikeouts in 38.2 innings; fastball averaging 96.0 mph, topping at 98.9; 24.4 percent strikeouts, 31.1 percent whiffsBaseball-Reference; tjstats.ca

How the plan changed.

The rehab plan adapted to how he felt day to day, while every surgeon-prescribed checkpoint was still met on schedule. Since then the plan has changed with the job and with the arm: a starter's workload in college and Single-A, rehab again after the later surgeries, a reliever's workload in Triple-A, and a fastball that kept climbing at 29.

  1. Evaluate
  2. Working Diagnosis
  3. Prioritize
  4. Intervene
  5. Reassess
  6. Adapt

Now.

Pitcher, Miami Marlins organization, Triple-A Jacksonville. Trains at ATP every offseason.

“I came to ATP fresh out of UCL reconstruction surgery. I decided to come to ATP instead of a traditional PT clinic because I wanted to be challenged throughout my rehab and surround myself with therapists and trainers who work with elite athletes on a daily basis. Taylor was incredible at listening to how I was feeling on a daily basis, using that information to adapt our plan as needed while ensuring that I hit every checkpoint in my surgeon-prescribed rehab plan.”
Jake Walkinshaw
Reviewing findings together at ATP

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