5:53 PM: Mikolas will earn a base salary of $2.25MM, according to Jon Heyman of the New York Post. Incentives can increase the value of the deal.
5:17 PM: The Nationals have formally announced the contract. DJ Herz has been placed on the 60-day injured list to open a spot for Mikolas on the 40-man roster. Herz underwent Tommy John surgery last April.
2:46 PM: The Nationals are signing veteran right-hander Miles Mikolas, reports Jake Mintz of Yahoo Sports. This comes after TalkNats reported that the two sides were talking on Tuesday morning. Mark Zuckerman of Nats Journal confirmed Mintz’s report, noting that it is a one-year deal. The Nationals will need to make room for Mikolas on their 40-man roster, but they can do so easily by moving DJ Herz to the 60-day IL.
Mikolas, 37, became a workhorse in his mid-thirties. He began his career with the Padres and Rangers before spending three years with the Yomiuri Giants in NPB. During the 2017-18 offseason, he signed with the Cardinals and made 32 starts in each of the next two years, but forearm issues kept him off the field for most of 2020-21. Since 2022, he has started at least 31 games each year, including a league-leading 35 in 2023. Only one pitcher, Logan Webb, has made more starts than Mikolas over the last four seasons, and only four have thrown more innings.
Unfortunately for Mikolas, the quality of those innings has declined as he has aged and his stuff has diminished. In 2025, he pitched to a 4.84 ERA and a 4.83 SIERA. While the righty has never been one to rack up strikeouts, his strikeout rate and strikeout-to-walk ratio dropped to 14.9% and 2.70, respectively, the lowest either has ever been since before he left for Japan. The only pitcher to throw at least 150 innings last year with a worse strikeout rate was Mikolas’s new Nationals teammate Mitchell Parker. Meanwhile, no pitcher (min. 150 IP) gave up barrels at a higher rate than Mikolas; according to Statcast’s xERA, he ranked among the bottom 9% of pitchers in MLB. Pitch models that evaluate raw stuff, such as Stuff+ and PitchingBot, also suggest that the veteran took a big step back in 2025. Overwhelming batters with nasty stuff was never how he succeeded, but his stuff metrics went from poor to some of the worst in the game this past season.
As negative as all that sounds, it’s important to keep in mind that Mikolas still took the mound 31 times in 2025, tossing 156 1/3 frames. He made eight quality starts and finished five innings in all but seven of his outings. The Nationals badly needed an innings eater for a woefully inexperienced rotation set to include names like Josiah Gray, Cade Cavalli, Foster Griffin, Jake Irvin, Brad Lord, and Parker. Of those arms, only Irvin and Parker have pitched so much as one qualifying major league season, while Gray is the only other to have a 30-start campaign under his belt. It’s a group replete with injury concerns, consistency issues, and limited track records. The dependable Mikolas will boost the floor of what projects to be one of the worst starting rotations in the league.
