Hayden Mullins Portland Sea Dogs Pitcher

       
 
Age: 24
Born: September 14, 2000
Birthplace: Gallatin, TN
Height: 6-0
Weight: 195
Bats: Left
Throws: Left
   
Drafted: 12th round, 2022 by BOS
How Acquired: Draft
College: Auburn
High School: Hendersonville (TN)
ETA: Late 2026

Photo © Kelly O'Connor
Pronunciation: ---
First Pro Contract: July 29, 2022 (BOS)
Signing Scout: Danny Watkins
Signing Bonus: $97,500
Rule 5 Draft Eligible: December 2025
MLFA Eligible: November 2028
   
Pro Debut: August 18, 2023 (FCL)
Added to 40-man: -
MLB Debut: -
Service Time (1/25): 0 days
Options Remaining: 3 (0 used)
Contract (2025): MiLB contract
   
Twitter: @haydenmullins22
Instagram: @_haydenmullins_

 
 
 
 
 
     
  Scouting Report & Links      
         
  Physical Description: Slightly undersized. Minimal remaining projection.

Mechanics: Throws from a three-quarters arm slot. Starts on the third base side of the rubber. Rigid delivery with effort. Plus extension and lower release height. Extremely high leg kick, during which he tucks in behind his glove arm and rotates his hips before he comes forward. Quick arm action.

Fastball: 92-94 mph. Tops out at 95 mph. Pitch jumps on hitters and shows life when up. High-quality fastball with premium bat-missing ability. Pitch has one of the highest whiff rates for any fastball in the system. Command and control are works in progress. Velocity could tick up in short bursts. Potential above-average offering.

Slider: 81-85 mph. High spin rate. Tight, two-plane shape. At lower velocities, has more sweepy shape. Advanced feel; has shown the ability to land it in the zone or bury it down and out when looking for a whiff. Potential above-average offering.

Curveball: 78-80 mph. Looked like a distinct pitch from his slider during Spring Training 2025. Two-plane break with more depth than the slider. Average potential.

Changeup: 81-83 mph. At its best, he throws it with deceptive arm speed and late drop, with the pitch falling off the table. Has flashed bat-missing ability, but is inconsistent. Potential fringe-average offering.
  Cutter: Did not use it in outing scouted in 2024, but has thrown about 10 percent of the time. Potential fringe-average offering.

Career Notes: Has battled injuries throughout his career. Was highly regarded out of high school, ranked as high as the top 50 in the 2019 draft class at times, but opted to attend Auburn after an injury-plagued senior spring caused his stock to fall. His sophomore and junior college seasons both ended prematurely due to injury, the latter resulting in Tommy John surgery. Did not make his professional debut until August 2023 after rehabbing from the procedure.

Summation: Potential volatile middle reliever. Ceiling of a seventh-inning reliever. Very intriguing arm who could move quickly if moved into a pure relief role. Needs to tighten up his command and control, but fastball/slider combination has premium bat-missing ability. Fastball especially is extremely difficult to hit when he elevates it. Has pitches to get both right- and left-handed hitters out and the type of fastball teams look for. Is currently being developed as a starter, but delivery, command profile, and injury history point to him ending up in the bullpen eventually.

Links
Spring Training Video (3.21.2025)
 
   
     
    Pitching Stats                                          
  year team lg level org age w l era g gs sv ip h r er hr hbp bb so whip k/9 bb/9
2020 Auburn SEC NCAA --- 19 1 0 3.68 5 0 0 7.1 4 3 3 1 0 6 10 1.36 12.27 7.36
  2021 Auburn SEC NCAA --- 20 2 0 2.38 7 0 0 11.1 10 4 3 0 1 4 19 1.24 15.09 3.18
  2022 Auburn SEC NCAA -- 21 2 1 3.63 11 8 0 34.2 23 16 14 4 9 25 43 1.38 11.16 6.49
  2022 DNP-Injured --- --- Bos 21 --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---
  2023 FCL Red Sox FCL Rk Bos 22 0 1 3.37 2 2 0 2.2 0 1 1 0 0 2 7 0.75 23.62 6.75
  2023 Salem Red Sox Car A Bos 22 0 1 7.36 2 2 0 3.2 1 3 3 0 1 3 8 1.09 19.64 7.36
  2024 Greenville Drive SAL A+ Bos 23 3 5 3.94 22 17 0 89.0 73 47 39 10 10 42 118 1.29 11.93 4.25
  2025 Greenville Drive SAL A+ Bos 24     stats                            
  2025 Portland Sea Dogs East AA Bos 24     stats                            
   
     
  Advanced Stats & Splits
   
     
  Awards   SoxProspects.com Awards  
  2017 WWBA World Championship All-Tournament Team
2019 Perfect Game Preseason First Team All-American
2019-20 First-Year SEC Academic Honor Roll
2021 SEC Spring Academic Honor Roll
2022 SEC Spring Academic Honor Roll
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