Mason Thompson has agreed to a one-year contract with the Nationals, avoiding arbitration with a salary of $770,000 in the majors and $374,600 in the minors. The right-hander, who turns 27 in February, missed the entire 2024 season due to Tommy John surgery, marking his second such surgery since high school. Selected by San Diego in the third round of the 2016 draft, Thompson made his MLB debut in 2021 and was traded to the Nationals later that year. He has a career record of 6-8 with a 4.53 ERA in 106 relief appearances.