The Arizona Fall League begins next week and the Phillies have eight players on the roster of the Surprise Saguaros. Between now and the AFL Opening Day, we’ll take a look at each of those players. Next up is right-hander Jack Dallas.

Background and Amateur Career

Jack Dallas, 26, played collegiate baseball at Lamar University. A right-handed pitcher listed at 5’11” and 200 pounds, Dallas spent five seasons at Lamar, gradually transitioning from a starter to a high-leverage reliever. His college career was marked by steady improvement, culminating in a dominant senior season in 2022 when he posted a 1.94 ERA over 41.2 innings with 55 strikeouts and just 14 walks. His strikeout rate peaked at 11.88 K/9 that year, showcasing his ability to miss bats at the collegiate level. Dallas went undrafted but signed with the Phillies in 2022. Despite being undrafted, he quickly proved his value in the Phillies system, beginning his minor league career with the Clearwater Threshers in the Florida State League.

Minor League Performance and Sabermetrics

Across four minor league seasons (2022–2025), Dallas compiled a 15–7 record with a 2.67 ERA over 178.1 innings. His WHIP of 1.15 and strikeout rate of 9.3 K/9 reflect solid command and swing-and-miss ability. He allowed just 0.4 HR/9, indicating strong home run suppression, and maintained a respectable walk rate of 3.0 BB/9. His best statistical season came in 2023, splitting time between Clearwater and Jersey Shore, posting a combined 1.79 ERA with 69 strikeouts in 65.1 innings. His FIP indicators suggest he outperformed his ERA slightly due to low HR totals and high strikeout-to-walk ratios.

Sabermetrically, Dallas excels in limiting hard contact and maintaining a high strikeout-to-walk ratio (career 3.00 SO/W). His BABIP has hovered near league average, suggesting his results are sustainable. However, his groundball-to-flyball ratio is not elite, and he relies more on deception and sequencing than overpowering stuff. His pitch efficiency and ability to strand runners have been key to his success, especially in high-leverage relief roles.

Pitch Arsenal and Usage

Dallas throws a three-pitch mix: a fastball, slider, and changeup. His fastball sits in the 91–93 mph range and is used primarily to establish counts. It has modest ride and is most effective up in the zone. His slider, thrown around 82–84 mph, is his best swing-and-miss pitch, generating a significant portion of his strikeouts with late horizontal break. He uses it roughly 35–40% of the time, especially against right-handed hitters. His changeup, thrown in the 84–86 mph range, is used sparingly but effectively against lefties, with decent fade and arm-side movement. While not overpowering, his pitch mix plays well thanks to his command and the ability to mix his pitches.

Injury History and Impact

Dallas has experienced multiple stints on the injured list, including placements in August 2024 and August 2025. He was also placed on the development list and temporarily inactive list in 2025, suggesting the Phillies were managing workload or addressing mechanical issues. Despite these setbacks, he returned to action and continued to perform effectively. However, the interruptions may have slowed his ascent through the system and limited his exposure to higher-level competition.

Projection and Development Outlook

Jack Dallas profiles as a potential middle-relief or setup man at the upper levels of the minors, with an outside shot at a major league debut if he continues to refine his command and maintain health. His pitchability, strikeout rates, and ability to handle right-handed hitters give him value, though his lack of elite velocity may cap his ceiling. If he can stay healthy and maintain his sabermetric strengths, he could become a reliable bullpen option in the Phillies system.