Hayden Mullins

Organization Prospect Rankings

• 
  Ranked Boston Red Sox #28 prospect in 2025
  BA Grade: 45/High
  
  Track Record: Mullins was a touted prep prospect who honored his commitment to Auburn after injuries clouded his senior year of high school. He was limited to just 53.1 innings over three college seasons. Mullins had Tommy John surgery prior to the 2022 draft and did not make his professional debut until August of 2024. The lefthander impressed in his first full season in 2024, pitching to a 3.94 ERA over 89 innings for High-A Greenville.
  
  Scouting Report: Mullins features one of the best fastballs in the Red Sox system and the pitch has continued to baffle hitters in Double-A. The pitch sits 92-93 mph touching 95 mph at peak with a flatter plane of approach and an unusual lefty angle. Mullins mixes a trio of secondaries in a mid-80s cutter, a low-to-mid-80s slider and a changeup. The slider is his primary secondary and features two-plane break, though he can manipulate the pitch to add more depth. He used his cutter more frequently in 2024. Mullins changeup is inconsistent and does not miss many bats. His fringe-average command is inconsistent from outing to outing.
  
  The Future: Mullins is showing more starter traits in 2025, but likely ends up in a relief role where his fastball and slider combination will play.
  
  Scouting Grades: Fastball: 60 | Slider: 55 | Changeup: 40 | Cutter: 45 | Control: 45.

Draft Prospects

• Ranked #119 prospect in 2019 draft
  There were instances last summer when Mullins appeared to be following in the footsteps of 2018 first-round pick Ryan Weathers, potentially giving the Tennessee high school ranks back-to-back prep lefthanders selected in the first round. Instead, Mullins has battled injuries throughout the spring and scouts have seen him infrequently. He didn't pitch at USA Baseball's National High School Invitational in early April, and when he has taken the mound his stuff has not been at the level that it was last summer. Mullins has pitched mostly in the 86-90 mph range this spring, occasionally touching 92 mph with below-average control. That is a stark contrast to what he showed when fully healthy last summer, when he had a low-90s fastball that touched 94 mph and a plus curveball in the 72-79 mph range with great depth. Mullins put on a clinic at last summer's East Coast Pro showcase, where he looked like one of the better pitching prospects in the class and certainly one of the top prep lefthanders. Mullins has a high leg kick in his delivery that's reminiscent of MacKenzie Gore, and he's previously shown the stuff and strike-throwing ability to be a Day 1 draft pick. However, the questions about his size--Mullins is listed at 6 feet, 190 pounds--and durability have grown louder this spring, to the point where he fits more in the third or fourth round. Mullins in an Auburn commit and could re-establish himself as a no-doubt first-round pick with a strong career in the Southeastern Conference.

• December, 2018 Scouting Report
  There were instances last summer when Mullins appeared to be following in the footsteps of 2018 first-round pick Ryan Weathers, potentially giving the Tennessee high school ranks back-to-back prep lefthanders selected in the first round. Instead, Mullins has battled injuries throughout the spring and scouts have seen him infrequently. He didn't pitch at USA Baseball's National High School Invitational in early April, and when he has taken the mound his stuff has not been at the level that it was last summer. Mullins has pitched mostly in the 86-90 mph range this spring, occasionally touching 92 mph with below-average control. That is a stark contrast to what he showed when fully healthy last summer, when he had a low-90s fastball that touched 94 mph and a plus curveball in the 72-79 mph range with great depth. Mullins put on a clinic at last summer's East Coast Pro showcase, where he looked like one of the better pitching prospects in the class and certainly one of the top prep lefthanders. Mullins has a high leg kick in his delivery that's reminiscent of MacKenzie Gore, and he's previously shown the stuff and strike-throwing ability to be a Day 1 draft pick. However, the questions about his size--Mullins is listed at 6 feet, 190 pounds--and durability have grown louder this spring, to the point where he fits more in the third or fourth round. Mullins in an Auburn commit and could re-establish himself as a no-doubt first-round pick with a strong career in the Southeastern Conference.