Nationals Place Trevor Williams On Injured List, Recall DJ Herz For MLB Debut

The Nationals announced Tuesday that they’ve placed right-hander Trevor Williams on the 15-day injured list due to a strained flexor muscle in his right forearm. Left-hander DJ Herz has been recalled from Triple-A Rochester and will make his MLB debut when he starts tonight’s game.

Williams is in the midst of a career year at age 32, having pitched 56 1/3 innings of 2.22 ERA ball out of the Washington rotation. He’s achieved those results in spite of a below-average 21% strikeout rate and benefited from both a .270 average on balls in play and minuscule 3.3% homer-to-flyball rate — all of which signal the potential for regression. Nonetheless, Williams’ performance thus far has been a major driving factor behind the Nationals exceeding preseason expectations and hanging around an NL Wild Card race that is largely populated by sub-.500 clubs at the moment.

The Nats didn’t provide a timetable for Williams’ return. That he’s dealing with a muscle strain as opposed to a damaged flexor tendon is perhaps a silver lining, but that doesn’t preclude a notable absence in and of itself. Teammate Josiah Gray is dealing with the same injury and has been on the shelf for nearly two months at this point. All injuries cases are different, and we don’t know how the placement and severity of Williams’ strain compares to that of Gray, but Gray’s injury is evidence that Williams is hardly assured a swift return to the mound.

The timing of the injury is particularly poor for both the team and Williams himself. If Washington were to hang around and make a Wild Card push, one would presume a healthy Williams would play a notable role. Even if he saw his pristine ERA regress toward the vicinity of his 3.97 SIERA, he’d still be a useful veteran presence on the staff. And if the Nats were to fall well out of the postseason picture, it’s easy to envision Williams becoming a sought-after trade chip. His injury throws a wrench into both scenarios.

On a personal level, it’s also poorly timed for the pitcher himself. Wiilliams is playing out the second season of a two-year, $13MM contract and is slated to reach free agency at season’s end. He landed that $13MM guarantee in the 2022-23 offseason on the heels of a year spent primarily in a swingman role with the Mets. Had Williams reached the market a second time on the heels of a two-year run as a starter — the second season being a career-best performance — he’d have been in line for a more substantial payday, even heading into his age-33 season. It’s still possible he could return in a relatively timely manner, pitch well and reach that endgame, but the injury muddies his chances of doing so.

Turning to the 23-year-old Herz, he’ll get his first big league start less than a year after being acquired in the trade that sent Jeimer Candelario from the Nats to the Cubs. The 2019 eighth-rounder has had mixed results in the minors this year. On the one hand, his 3.75 ERA and 27.5% strikeout rate in Rochester are both strong marks. On the other, Herz has averaged just four innings per start and walked an astounding 19% of his opponents. Command has always been a weakness for the 6’2″ lefty; he’s never walked fewer than 13% of his opponents in a full season.

The Nats have already had one lefty make his MLB debut and greatly exceed expectations this season. They’ll hope that Herz can follow in the footsteps of teammate Mitchell Parker in that regard. Given the state of the rebuilding Nationals and the lack of other upper-minors pitching depth, Herz could have a fairly long runway to prove himself in the event that Williams and/or Gray remain sidelined for a significant period. Top prospect Cade Cavalli stands as one potential alternative, but he’s being monitored carefully in his return from 2023 Tommy John surgery. Prospect Jackson Rutledge and last season’s Rule 5 pick, Thaddeus Ward, are both on the 40-man roster in Rochester but both have ERAs north of 6.00 in Triple-A this season.