Rangers Agree to Minor-League Deal With Right-Hander Mason Thompson

Mason Thompson, a 6-foot-6 right-hander from Round Rock, agreed to a minor-league contract with the Texas Rangers and was assigned to Triple-A Round Rock, giving the organization a hometown arm with major-league experience to sort through in spring camp. The move plugs another veteran option into a bullpen-building strategy that has leaned on low-cost, one-year pickups and reclamation projects.

The signing appears on the Rangers’ transaction log and drew immediate attention for its local ties. “It’s a homecoming for the Round Rock native,” one report noted, and Sports Illustrated wrote, “The Texas Rangers are bringing home a Texas‑born pitcher on a minor league deal that adds him to the bullpen options.” Those lines underline why the club saw value in Thompson beyond raw numbers: familiarity with the local environment and proximity to Dell Diamond, the home of the Round Rock Express.

Thompson is a third-round pick from 2016 who has logged parts of four big-league seasons with the San Diego Padres and Washington Nationals. Career figures vary slightly by source, but multiple outlets cite a 5.21 ERA in roughly 114 innings of big-league work. Sports Illustrated lists Thompson’s career as a 7-9 record and a 5.21 ERA in 120 games, with two saves, 93 strikeouts and 58 walks in 114 innings. Last season was a rough return to the mound: he was tagged for 16 earned runs in 10 2/3 major-league innings, producing an 11.81 ERA, and also posted an ERA north of 6.00 in 16 minor-league frames.

Health and recovery will be the storyline to watch. Several outlets describe 2025 as Thompson’s first action since Tommy John surgery in spring of 2024. One analysis added context: “Though Thompson’s 2025 performance was rocky to say the least - he also posted an ERA over 6.00 in 16 minor league frames - it bears mentioning that this was his first time back on the mound following Tommy John surgery in spring of 2024.” In contrast, Sports Illustrated includes a conflicting account, noting, “The 27-year-old had his second Tommy John surgery in February of 2026 and is two years removed from the surgery.” Those statements cannot both be true and will need clarification from team medical reports or Thompson’s representatives.

Scouting notes list a multi-look relief profile: a four-seam fastball, a complementary pitch of similar velocity, a mid-80s slider and an occasional changeup. That mix and Thompson’s 6-6, 240-pound frame give the Rangers a power arm with swing-and-miss potential if his control and command return to pre-injury levels. As one preview observed, “He’ll look to complete his recovery and compete for a job in the Rangers' bullpen, and if he can return to his pre-surgery production, he will be an interesting depth option to monitor in spring training.”

For fans, Thompson’s signing is both a hometown storyline and a practical roster move. He adds experienced depth to a Texas organization still assembling its relief corps, and his early assignment to Round Rock means fans can track his progress up close. The next checkpoints: confirmation of his medical timeline, his performance in minor-league spring outings, and whether the Rangers add him as a non-roster invitee to major-league camp later this month.