Tag: hayden mullins

How did Red Sox LHP prospect, Double-A Portland Pitcher of the Year Hayden Mullins fare in 2025?

Last month, Red Sox prospect Hayden Mullins was recognized as Double-A Portland’s 2025 Pitcher of the Year. This article will examine how the 25-year-old left-hander fared this season.

Mullins broke camp and got the Opening Day nod for High-A Greenville this spring. The lefty posted a 1.06 ERA (1.69 FIP) with 27 strikeouts to just three walks in his first four outings (three starts) and 17 innings of the year before receiving a promotion to Portland in late April. He made his Double-A debut against New Hampshire on May 1 and electrified, striking out 10 (to match a career-high) over 5 2/3 innings of one-run ball.

Unfortunately, Mullins was placed on Portland’s injured list four days later due to shoulder fatigue and did not return to the mound until May 25. He then picked up where he left off by posting a 2.74 ERA (4.33 FIP) with 25 strikeouts to 15 walks in his next six starts (23 innings) for the Sea Dogs through the end of June. On July 1, he threw an immaculate inning against New Hampshire but left the game early with cramps. That led to him making just one more appearance before the MLB All-Star break began on July 14.

Upon returning from the break, Mullins compiled a 2.42 ERA (3.38 FIP) with 53 strikeouts to 26 walks in his final nine starts (44 2/3 innings) of the year. Altogether, he forged a 2.44 ERA (3.79 FIP) with 96 strikeouts to 48 walks over 18 starts (84 2/3 innings) for Portland this season. Opposing hitters in the Eastern League batted .175 against him.

Among 40 pitchers who threw at least 80 innings in the Eastern League this year, Mullins ranked second in batting average against and ERA, third in strikeout rate (27.7 percent), sixth in strikeouts per nine innings (10.2), seventh in swinging-strike rate (13 percent), ninth in WHIP (1.17), 14th in FIP, 17th in xFIP (3.83), and 19th in groundball rate (40.9 percent), per FanGraphs.

Between Greenville and Portland in 2025, Mullins produced a 2.21 ERA (3.44 FIP) with 123 strikeouts to 51 walks across 22 total appearances (21 starts) spanning a career-high 101 2/3 innings of work. In addition to taking home Pitcher of the Year honors for the Sea Dogs, he was named a SoxProspects.com All-Star for the first time.

Mullins was originally selected by the Red Sox in the 12th round (369th overall) of the 2022 draft out of Auburn. The Tennessee native was recovering from Tommy John surgery at the time he signed for $97,500, which pushed his professional debut back until August 2023. Just over two years later, he is ranked as the No. 18, No. 22, and No. 26 prospect in Boston’s farm system by MLB Pipeline, SoxProspects.com, and Baseball America, respectively.

Standing at 6-feet and 194 pounds, Mullins throws from a three-quarters arm slot and incorporates a high leg kick into his deceptive delivery. As noted in his SoxProspects.com scouting report, the undersized southpaw operates with a five-pitch mix that consists of a 92-94 mph fastball that tops out at 95 mph, an 81-85 mph slider, a 78-80 mph curveball, an 81-83 mph changeup, and a mid-80s cutter.

Mullins, who just turned 25 in September, is a candidate to be added to the Red Sox’ 40-man roster next month to prevent him from becoming available to other clubs in December’s Rule 5 Draft. Such a move may be met with criticism since Mullins has yet to pitch above the Double-A level and appears headed for a move to the bullpen given his command and control issues, but his profile could make him an attractive option to a team in need of a bat-missing lefty reliever this winter.

If he remains with the Red Sox through the offseason, Mullins is projected by SoxProspects.com to make the jump to Triple-A Worcester in a relief role to open the 2026 campaign.

(Picture of Hayden Mullins: Ella Hannaford/Minor League Baseball)

Red Sox to promote pitching prospect Hayden Mullins to Double-A Portland

The Red Sox are promoting pitching prospect Hayden Mullins from High-A Greenville to Double-A Portland, as was first reported by Andrew Parker of Beyond the Monster.

Mullins, 24, has certainly gotten his season off to an encouraging start. In four outings (three starts) to open the 2025 campaign for Greenville, the left-hander posted a 1.06 ERA (2.22 FIP) with 27 strikeouts to three walks over 17 innings in which opposing hitters batted just .186 against him. He fanned six across four scoreless frames in his last time out against Hub City this past Thursday.

Entering play on Sunday, Mullins was one of 31 qualified pitchers in the South Atlantic League. Among those 31, he ranked first in strikeout rate (42.9 percent) and xFIP (2.10), second in strikeouts per nine innings (14.29), third in FIP and swinging-strike rate (16.5 percent), fifth in ERA, eighth in walks per nine innings (1.59) and walk rate (4.8 percent), 10th in WHIP (0.82), 13th in batting average against and line-drive rate (20 percent), and 15th in groundball rate (44 percent), per FanGraphs.

A former 12th-round draft selection of the Red Sox coming out of Auburn in 2022, Mullins received a $97,500 signing bonus but did not make his professional debut until August 2023 due to Tommy John surgery recovery and rehab. The Tennessee native spent all of 2024 with Greenville and has since compiled a 3.48 ERA (3.81 FIP) with 145 strikeouts to 45 walks over 106 total innings at the High-A level.

Listed at 6-foot and 194 pounds, Mullins throws from a three-quarters arm slot and incorporates a high leg kick into his delivery. As noted in his SoxProspects.com scouting report, the under-the-radar lefty operates with a four-pitch mix that consists of a 92-94 mph fastball that reaches 95 mph, an 81-85 mph slider, a 78-80 mph curveball, and an 81-83 mph changeup. He has flashed bat-missing ability with most, if not all, of his offerings.

Mullins, who turns 25 in September, is currently regarded by SoxProspects.com as the No. 29 prospect in Boston’s farm system, which ranks 14th among pitchers in the organization. He is not included in Baseball America’s or MLB Pipeline’s Top 30 Red Sox prospects list at the moment, but that could soon change if he shows that he can adjust and hold his own against more advanced competition in the upper-minors.

As he prepares to make the leap from High-A to Double-A for the first time, it is worth noting that Mullins can become eligible for this winter’s Rule 5 Draft if he is not added to Boston’s 40-man roster by the November protection deadline. The Red Sox will presumably use this promotion to help determine if Mullins is worthy of such a spot, though he could emerge as a possible trade candidate well before that decision needs to be made.

Regardless, Mullins is slated to join a talented pitching staff in Portland that– as of this writing– includes the likes of David Sandlin, Yordanny Monegro, Blake Wehunt, and fellow southpaw Connelly Early, among others. He will likely make his Double-A debut at some point during the Sea Dogs’ upcoming series on the road against the New Hampshire Fisher Cats this coming week.

(Picture of Hayden Mullins: Kelly O’Connor/sittingstill.smugmug.com)

How did Red Sox pitching prospect Hayden Mullins fare in first full pro season?

Red Sox pitching prospect Hayden Mullins went a career-high 5 2/3 innings in his final outing of the season for High-A Greenville last Wednesday.

Taking over for starter Tyler Uberstine with one out in the top of the second, Mullins retired 15 of the 19 batters he faced over 5 2/3 scoreless frames of relief. The 23-year-old left-hander allowed three hits and one walk while striking out five. He threw 70 pitches (44 strikes), eliciting 12 swings-and-misses as the Drive ultimately fell to the Winston-Salem Dash, 1-0, at Fluor Field.

In 22 appearances (17 starts) for Greenville this season, Mullins posted a 3.94 ERA and 4.12 FIP with 118 strikeouts to 42 walks over a staff-leading 89 innings. That includes a 3.33 ERA (3.97 FIP) with 28 strikeouts to eight walks in his final five outings (24 1/3 innings) dating back to August 10. Opposing hitters batted just .221 against him during that stretch.

Among the 27 pitchers who threw at least 85 innings in the South Atlantic League this year, Mullins ranked second in strikeouts per nine innings (11.93), third in swinging-strike rate (15.1 percent), fourth in strikeout rate (30.3 percent), fifth in xFIP (3.70), eighth in batting average against (.223), 10th in groundball rate (42.7 percent), 12th in FIP and WHIP (1.29), and 13th in ERA, per FanGraphs.

Mullins, who turns 24 on Saturday, was selected by the Red Sox in the 12th round (369th overall) of the 2022 draft out of Auburn. The Tennessee native signed with the club for $97,500 but did not make his professional debut until last August as he was still recovering from Tommy John surgery. He is currently regarded by SoxProspects.com as the No. 26 prospect in Boston’s farm system, which ranks 13th among pitchers in the organization.

Listed at 6-foot and 194 pounds, Mullins throws from a three-quarters arm slot and incorporates a high leg kick into his delivery. As noted by SoxProspects.com’s director of scouting Ian Cundall, who saw Mullins pitch in-person on August 23, the undersized lefty sits between 91-94 mph and tops out at 95 mph with his fastball. He also mixes in an 81-85 mph sweeping slider and a deceptive 83-85 mph changeup.

Should he remain with the Red Sox through the winter, Mullins is projected by SoxProspects.com to make the jump to Double-A Portland in 2025. He has intriguing potential as a pure reliever but will need to shore up his command and control to remain in a starting role moving forward.

(Picture of Hayden Mullins: Kelly O’Connor/sittingstill.smugmug.com)

Red Sox select Auburn left-hander Hayden Mullins with 12th-round pick in 2022 MLB Draft

With the 369th overall pick in the 2022 MLB first-year player draft, the Red Sox selected Auburn University left-hander Hayden Mullins.

Mullins, 21, is not regarded by Baseball America as one of the top pitching prospect’s in this year’s draft class, though the Tennessee native was ranked 119th by BA coming out of high school in 2019.

While he was not drafted back then, Mullins recently put the finishing touches on a junior season with Auburn in which he posted a 3.63 ERA and 1.39 WHIP to go along with 43 strikeouts to 25 walks over 11 appearances (eight starts) spanning 34 2/3 innings of work for the Tigers.

One of the primary reasons Mullins was limited to just 34 2/3 innings this spring was because of injury. On March 25, he left his start against Texas A&M after throwing three innings. On April 29, he left his start against Tennessee after throwing 1 2/3 innings and was later shut down for the rest of the season due to an elbow injury.

Listed at 6-foot and 194 pounds, Mullins has a high leg kick in his delivery and works with an 86-90 mph fastball that reaches 92 mph as well as a 72-79 mph curveball, per his 2019 scouting report.

Mullins, who turns 22 in September, has eligibility remaining so it is no sure thing he will go pro right now. Regardless of that, though, it is worth mentioning that the lefty played with 2021 ninth-rounder Tyler Miller as both a freshman and sophomore at Auburn.

The recommended slot value attached to the 369th pick in the 2022 draft comes in at $125,000, which is actually the case for all of Boston’s Day 3 selections. The Red Sox will have until the end of the month to sign Mullins.

(Picture of Hayden Mullins: Auburn University Athletics)