Rangers, Mason Thompson Agree To Minor League Deal

The Rangers have agreed to a minor league contract with free agent righty Mason Thompson, per the team’s transaction log at MLB.com. It’s a homecoming for the Round Rock native, who’ll presumably be in big league camp with the club later this month.

A third-round pick by the Padres in 2016, Thompson has pitched in parts of four big league seasons between the Friars and the Nationals. The 6’6″, 240-pound righty been tagged for a 5.21 ERA in 114 innings, with a gruesome 11.81 ERA (16 runs in 10 2/3 innings) this past season skewing that mark a bit. 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.

Prior to his injury, Thompson pitched 103 1/3 major league frames with a more palatable 4.53 ERA. His 17.7% strikeout rate and 10% walk rate were both notably worse than league average, but his 51.1% ground-ball mark was excellent. The velocity on Thompson’s sinker was down a big in his return, but he still averaged a hearty 95 mph on the pitch, complementing it with a lesser-used four-seamer at the same velocity, a mid-80s slider and a very occasional upper-80s changeup.

Because they cobbled together their 2025 bullpen primarily via a series of low-cost, one-year contracts, the Rangers entered the 2025-26 offseason in need of nearly an entirely new relief corps. They’ve followed a similar path to the one they took last winter, adding veterans Chris Martin (who re-signed), Jakob Junis, Alexis Diaz and Tyler Alexander on one-year contracts and claiming righty Michael Otañez off waivers. Assuming he is indeed invited to camp, Thompson will be the most experienced bullpen arm among Texas’ collection of non-roster invitees.