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Hayden Mullins
- Portland Sea Dogs - AA
- LHP
Collapse Explore Scouting Report
- Bats: L / Throws: L
- Age: 25
- Rule 5 Eligible: After 2026 Season
- Acquisition Method: Draft
Scouting Report
For some, it’s a surprise that Mullins remained in the organization after his 2025 season that saw him go 8-2 with a 2.21 ERA in 22 games (21 starts) between Greenville and Portland. He tossed 101 2/3 innings while striking out 123 batters. For his dominance, (7-2 record, 2.44 ERA, 84 2/3 innings, 96 strikeouts), he was named the 2025 Portland Sea Dogs Pitcher of the Year.
Entering the Rule 5 Draft, there was a lot of concern that Mullins could be selected after his 2025 season, especially as many felt that his stuff could play well out of the bullpen a role. Instead, he was not selected and returned to the Boston organization for the 2026 season where he’s looked rather good so far including being part of a no-hitter on April 26.
Mullins throws from a three-quarters slot and starts on the third base side of the rubber. His motion tends to involve a high leg kick and rotates his hips. He’s also viewed as having good extension, which we all know Craig Breslow loves. He has a five-pitch arsenal that is made up of a four-seam fastball, slider, sweeper, changeup and cutter.
His fastball tends to average around 92 to 95 mph and can show life up in the zone. It’s been shown to have bat-missing ability so far through his minor-league career despite the command and control still being a work in progress. If he were in the bullpen, the velocity could potentially increase for shorter outings, which would place it in plus territory.
The slider tends to be between 81 and 85 mph with a high spin rate. He has an advanced feel for it and when at a lower velocity, it sometimes takes on a shape similar to a sweeper. He can land it in the zone or throw it down and outside of the zone if he is hoping to get the batter to chase.
The sweeper averages between 77 and 80 mph and has been a work in progress for Mullins. In 2025, he managed to make it more into its own pitch and has shown bat missing ability.
The changeup and cutter are his weakest pitches, as the changeup sits between 81 and 83 mph. When the changeup is on, it flashes a late drop and thrown with an arm speed that makes it deceptive. When it isn’t on, the pitch doesn’t work as well and because of that it’s viewed as very inconsistent. The cutter is a pitch that he hasn’t used as much since 2024 but is viewed as having average traits.
Mullins has battled injuries in his career, and even before his career started as he was drafted shortly after having Tommy John surgery. As such, being drafted in 2022, he would not make his organizational debut until August of 2023 and that would take place in the Florida Complex League. Last year, he also deal with a bout of shoulder fatigue that had him miss most of May. Due to the injury concerns and his command issues, there is belief he could work best out of the bullpen in a one- or two-inning role, especially if he focuses on a fastball/slider combination. However, due to a deep arsenal that can work against both left-handed and right-handed hitters, the organization will look to develop him as a starter until he struggles in that role.
Monthly Splits
| Split | Team | W | L | ERA | G | GS | CG | SHO | SV | SVO | IP | H | R | ER | HR | HB | BB | IBB | SO | AVG | WHIP | GO/AO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No Outs | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 9.2 | 5 | -- | -- | 0 | 0 | 6 | 0 | 12 | .156 | 1.14 | 0.36 |
| Two Outs | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 8.1 | 4 | -- | -- | 1 | 0 | 5 | 0 | 13 | .143 | 1.08 | 0.57 |
| Runners at 1st & 2nd | POR | -- | -- | -- | 5 | -- | -- | -- | -- | -- | 1.1 | 2 | -- | -- | 0 | 0 | 1 | 0 | 1 | .400 | 2.25 | 1.00 |
| One Out | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 9.2 | 5 | -- | -- | 0 | 2 | 4 | 0 | 17 | .161 | 0.93 | 0.67 |
| Ahead in Count | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 8.1 | 5 | -- | -- | 0 | 1 | 0 | 0 | 18 | .172 | 0.60 | 0.50 |
| Starter | POR | 1 | 1 | 3.74 | 5 | 5 | 0 | 0 | 0 | 0 | 21.2 | 12 | 12 | 9 | 0 | 2 | 14 | 0 | 32 | .169 | 1.20 | 0.56 |
| Batting Seventh | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 2.1 | 3 | -- | -- | 1 | 0 | 3 | 0 | 5 | .375 | 2.57 | 0.00 |
| Runners at 1st & 3rd | POR | -- | -- | -- | 4 | -- | -- | -- | -- | -- | 1.2 | 0 | -- | -- | 0 | 0 | 1 | 0 | 2 | .000 | 0.60 | 2.00 |
| Batting Sixth | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 3.2 | 2 | -- | -- | 0 | 0 | 0 | 0 | 4 | .167 | 0.55 | 1.00 |
| Batting Ninth | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 2.2 | 1 | -- | -- | 0 | 0 | 2 | 0 | 4 | .111 | 1.13 | 0.00 |
| Bases Loaded | POR | -- | -- | -- | 2 | -- | -- | -- | -- | -- | 0.1 | 0 | -- | -- | 0 | 0 | 1 | 0 | 1 | .000 | 3.00 | -.-- |
| Batting Eighth | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 3.1 | 1 | -- | -- | 0 | 0 | 2 | 0 | 4 | .111 | 0.90 | 1.00 |
| On Grass | POR | 2 | 1 | 3.58 | 6 | 5 | 0 | 0 | 0 | 0 | 27.2 | 14 | 14 | 11 | 1 | 2 | 15 | 0 | 42 | .154 | 1.05 | 0.50 |
| Day Games | POR | 2 | 1 | 3.18 | 5 | 4 | 0 | 0 | 0 | 0 | 22.2 | 9 | 11 | 8 | 1 | 2 | 14 | 0 | 34 | .123 | 1.01 | 0.48 |
| Home Games | POR | 0 | 1 | 5.06 | 3 | 3 | 0 | 0 | 0 | 0 | 10.2 | 4 | 9 | 6 | 0 | 1 | 12 | 0 | 16 | .121 | 1.50 | 0.75 |
| First Inning | POR | -- | -- | 0.00 | 5 | -- | -- | -- | -- | -- | 5.0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | .063 | 0.20 | 2.00 |
| Second Inning | POR | -- | -- | 12.71 | 6 | -- | -- | -- | -- | -- | 5.2 | 5 | 9 | 8 | 1 | 0 | 7 | 0 | 8 | .278 | 2.12 | 0.50 |
| Away Games | POR | 2 | 0 | 2.65 | 3 | 2 | 0 | 0 | 0 | 0 | 17.0 | 10 | 5 | 5 | 1 | 1 | 3 | 0 | 26 | .172 | 0.76 | 0.38 |
| Seventh Inning | POR | -- | -- | 0.00 | 1 | -- | -- | -- | -- | -- | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | .000 | 0.00 | 0.00 |
| Runner at 3rd | POR | -- | -- | -- | 2 | -- | -- | -- | -- | -- | 1.0 | 0 | -- | -- | 0 | 0 | 1 | 0 | 3 | .000 | 1.00 | -.-- |
| Behind in Count | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 4.1 | 5 | -- | -- | 0 | 1 | 15 | 0 | 7 | .294 | 4.62 | 1.00 |
| Runner at 2nd | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 1.1 | 0 | -- | -- | 0 | 0 | 2 | 0 | 1 | .000 | 1.50 | 0.00 |
| May | POR | 1 | 0 | 4.09 | 2 | 1 | 0 | 0 | 0 | 0 | 11.0 | 7 | 5 | 5 | 1 | 0 | 2 | 0 | 18 | .184 | 0.82 | 0.44 |
| Leading Off Inning | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 6.2 | 3 | -- | -- | 0 | 0 | 5 | 0 | 8 | .130 | 1.20 | 0.33 |
| April | POR | 1 | 1 | 3.24 | 4 | 4 | 0 | 0 | 0 | 0 | 16.2 | 7 | 9 | 6 | 0 | 2 | 13 | 0 | 24 | .132 | 1.20 | 0.53 |
| Runners at 2nd & 3rd | POR | -- | -- | -- | 1 | -- | -- | -- | -- | -- | 0.2 | 0 | -- | -- | 0 | 0 | 0 | 0 | 1 | .000 | 0.00 | 0.00 |
| Scoring Position | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 6.1 | 2 | -- | -- | 0 | 0 | 6 | 0 | 9 | .118 | 1.26 | 0.75 |
| Third Inning | POR | -- | -- | 3.60 | 5 | -- | -- | -- | -- | -- | 5.0 | 3 | 4 | 2 | 0 | 0 | 2 | 0 | 7 | .158 | 1.00 | 0.29 |
| vs Right | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 15.1 | 9 | -- | -- | 1 | 1 | 12 | 0 | 27 | .173 | 1.37 | 0.45 |
| Fourth Inning | POR | -- | -- | 1.80 | 5 | -- | -- | -- | -- | -- | 5.0 | 3 | 1 | 1 | 0 | 2 | 3 | 0 | 9 | .176 | 1.20 | 0.25 |
| Fifth Inning | POR | -- | -- | 0.00 | 4 | -- | -- | -- | -- | -- | 4.0 | 1 | 0 | 0 | 0 | 0 | 3 | 0 | 5 | .091 | 1.00 | 1.50 |
| Runner at 1st | POR | -- | -- | -- | 5 | -- | -- | -- | -- | -- | 5.0 | 4 | -- | -- | 0 | 1 | 2 | 0 | 6 | .235 | 1.20 | 0.17 |
| Reliever | POR | 1 | 0 | 3.00 | 1 | 0 | 0 | 0 | 0 | 0 | 6.0 | 2 | 2 | 2 | 1 | 0 | 1 | 0 | 10 | .100 | 0.50 | 0.33 |
| Sixth Inning | POR | -- | -- | 0.00 | 2 | -- | -- | -- | -- | -- | 2.0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | .143 | 0.50 | 0.00 |
| Bases Empty | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 16.1 | 8 | -- | -- | 1 | 1 | 7 | 0 | 27 | .140 | 0.92 | 0.57 |
| Night Games | POR | 0 | 0 | 5.40 | 1 | 1 | 0 | 0 | 0 | 0 | 5.0 | 5 | 3 | 3 | 0 | 0 | 1 | 0 | 8 | .278 | 1.20 | 0.67 |
| vs Left | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 12.0 | 5 | -- | -- | 0 | 1 | 3 | 0 | 15 | .128 | 0.67 | 0.54 |
| Batting Third | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 3.0 | 2 | -- | -- | 0 | 1 | 0 | 0 | 7 | .182 | 0.67 | 2.00 |
| Batting Second | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 2.2 | 3 | -- | -- | 0 | 0 | 0 | 0 | 4 | .250 | 1.13 | 0.67 |
| Batting Fifth | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 2.0 | 1 | -- | -- | 0 | 1 | 4 | 0 | 3 | .143 | 2.50 | 0.00 |
| Batting Fourth | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 3.1 | 0 | -- | -- | 0 | 0 | 2 | 0 | 5 | .000 | 0.60 | 0.00 |
| Batting First | POR | -- | -- | -- | 6 | -- | -- | -- | -- | -- | 4.1 | 1 | -- | -- | 0 | 0 | 2 | 0 | 6 | .077 | 0.69 | 1.00 |
| First Half | POR | 2 | 1 | 3.58 | 6 | 5 | 0 | 0 | 0 | 0 | 27.2 | 14 | 14 | 11 | 1 | 2 | 15 | 0 | 42 | .154 | 1.05 | 0.50 |
| Season | Team | LG | Level | W | L | ERA | G | GS | CG | SHO | HLD | SV | SVO | IP | H | R | ER | HR | NP | HB | BB | IBB | SO | AVG | WHIP | GO/AO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2023 | 2 teams | - | Minors | 0 | 2 | 5.68 | 4 | 4 | 0 | 0 | 0 | 0 | 0 | 6.1 | 1 | 4 | 4 | 0 | 109 | 1 | 5 | 0 | 15 | .048 | 0.95 | 1.50 |
| 2023 | F-RSX | FCL | ROK | 0 | 1 | 3.38 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 2.2 | 0 | 1 | 1 | 0 | 34 | 0 | 2 | 0 | 7 | .000 | 0.75 | 1.00 |
| 2023 | SAL | CAR | A | 0 | 1 | 7.36 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 3.2 | 1 | 3 | 3 | 0 | 75 | 1 | 3 | 0 | 8 | .083 | 1.09 | 2.00 |
| 2024 | GVL | SAL | A+ | 4 | 5 | 3.94 | 22 | 17 | 0 | 0 | 1 | 0 | 0 | 89.0 | 73 | 47 | 39 | 10 | 1499 | 10 | 42 | 0 | 118 | .223 | 1.29 | 1.03 |
| 2025 | 2 teams | - | Minors | 8 | 2 | 2.21 | 22 | 21 | 0 | 0 | 0 | 0 | 0 | 101.2 | 62 | 28 | 25 | 7 | 1642 | 5 | 51 | 0 | 123 | .177 | 1.11 | 0.90 |
| 2025 | GVL | SAL | A+ | 1 | 0 | 1.06 | 4 | 3 | 0 | 0 | 0 | 0 | 0 | 17.0 | 11 | 2 | 2 | 1 | 279 | 1 | 3 | 0 | 27 | .186 | 0.82 | 1.33 |
| 2025 | POR | EAS | AA | 7 | 2 | 2.44 | 18 | 18 | 0 | 0 | 0 | 0 | 0 | 84.2 | 51 | 26 | 23 | 6 | 1363 | 4 | 48 | 0 | 96 | .175 | 1.17 | 0.85 |
| 2026 | POR | EAS | AA | 2 | 1 | 3.58 | 6 | 5 | 0 | 0 | 0 | 0 | 0 | 27.2 | 14 | 14 | 11 | 1 | 433 | 2 | 15 | 0 | 42 | .154 | 1.05 | 0.50 |
| Date | Team | OPP | W | L | ERA | G | GS | CG | SHO | SV | SVO | IP | H | R | ER | HR | HB | BB | IBB | SO | AVG | WHIP | GO/AO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-04-07 | POR | vs NH | 0 | 1 | 27.00 | 1 | 1 | 0 | 0 | 0 | 0 | 1.2 | 0 | 5 | 5 | 0 | 0 | 5 | 0 | 4 | .000 | 3.00 | 0.00 |
| 2026-04-12 | POR | vs NH | 0 | 0 | 9.53 | 1 | 1 | 0 | 0 | 0 | 0 | 4.0 | 4 | 2 | 1 | 0 | 1 | 2 | 0 | 7 | .211 | 1.94 | 0.25 |
| 2026-04-19 | POR | @ ALT | 1 | 0 | 4.63 | 1 | 1 | 0 | 0 | 0 | 0 | 6.0 | 3 | 0 | 0 | 0 | 1 | 1 | 0 | 8 | .179 | 1.29 | 0.27 |
| 2026-04-26 | POR | vs HFD | 0 | 0 | 3.24 | 1 | 1 | 0 | 0 | 0 | 0 | 5.0 | 0 | 2 | 0 | 0 | 0 | 5 | 0 | 5 | .132 | 1.20 | 0.53 |
| 2026-05-03 | POR | @ SOM | 1 | 0 | 3.18 | 1 | 0 | 0 | 0 | 0 | 0 | 6.0 | 2 | 2 | 2 | 1 | 0 | 1 | 0 | 10 | .123 | 1.01 | 0.48 |
| 2026-05-12 | POR | @ HFD | 0 | 0 | 3.58 | 1 | 1 | 0 | 0 | 0 | 0 | 5.0 | 5 | 3 | 3 | 0 | 0 | 1 | 0 | 8 | .154 | 1.05 | 0.50 |
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