Mason Thompson: Everything you need to know

Thompson (biceps) struck out two batters in a perfect inning Friday in the Rangers' 7-3 loss to the Royals in Cactus League play. Thompson is attending Rangers camp as a non-roster invitee and appears to be fully healthy after missing the final week of the 2025 campaign when the Nationals placed him on the injured list due to right biceps tendinitis. The right-hander looks like a long shot to make the Rangers' Opening Day bullpen and will likely be assigned to Triple-A Round Rock before the end of camp.

The Rangers signed Thompson (biceps) to a minor-league contract Tuesday. Thompson permitted 14 earned runs over just 10.2 innings in 2025 for the Nationals and also had a 6.61 ERA in the minors in his first season back from Tommy John surgery. He ended the 2025 campaign on the injured list with biceps tendinitis and it's unclear whether he'll have any restrictions at the beginning of spring training.

Thompson (biceps) cleared waivers Wednesday and elected free agency. Thompson appeared in 14 games for the Nationals this year, giving up 14 earned runs over just 10.2 innings. He ended the regular season on the injured list with biceps tendinitis, though he is expected to be fully recovered by the time spring training begins. His next gig will likely come in the form of a minor-league contract.