Poulin will serve as the Nationals' opening pitcher for Tuesday's game against the Phillies, Mark Zuckerman of NatsJournal.com reports.

Poulin has appeared in two games so far this season, walking two and striking out one over 1.2 scoreless frames. He'll likely work the first inning before giving way to a primary pitcher, who the Nationals have yet to name. Zack Littell could be in the mix to eat up innings considering he's the only starter who's yet to see action in 2026.

Hentges (knee/shoulder) threw 20 pitches during his live batting practice in Arizona on Monday, Shayna Rubin of the San Francisco Chronicle reports.

Hentges continues to progress in his recovery from surgeries on his left shoulder and right knee. He opened the season on the 15-day injured list and will need to embark on a rehab assignment before being cleared for major-league action. The last time Hentges pitched in the majors was in 2024 with the Guardians, when he appeared in 25 regular-season games and posted a 3.04 ERA, 0.97 WHIP, nine holds and a 27:5 K:BB across 23.2 innings.

Adam (quadriceps) will throw a simulated game Tuesday before making back-to-back rehab appearances with Double-A San Antonio on Friday and Saturday, Jeff Sanders of The San Diego Union-Tribune reports.

Making rehab appearances on back-to-back days is typically the final hurdle a pitcher needs to clear before rejoining the major-league roster, so Adam appears set for activation from the 15-day injured list when first eligible April 6. The veteran reliever is getting a late start to the season following surgery last September to repair a ruptured left quadriceps tendon. Adam will work in a setup role in front of closer Mason Miller.

Schultz (elbow) struck out two and allowed no hits and one walk over 1.2 scoreless innings in his first rehab appearance Saturday for Triple-A Rochester.

The appearance was Schultz's first since Feb. 28, after he had missed the final three weeks of the Grapefruit League due to right elbow inflammation. The 28-year-old will likely make at least another rehab appearance or two before returning from the injured list. While the Nationals will likely use him in lower-leverage spots initially once he's activated, Schultz could quickly move his way into a more prominent role if he pitches well early on, given the lack of established options in the bullpen.

Acton was designated for assignment by the Marlins on Sunday, Jordan McPherson of the Miami Herald reports.

Acton is the odd man out on Miami's 40-man roster after the team acquired infielder Leo Jimenez from the Blue Jays on Sunday. Acton has tossed 2.1 scoreless frames, allowing one hit and one walk while striking out four batters in two appearances with Triple-A Jacksonville so far this season. The 27-year-old was claimed off waivers by Miami after the Rockies let him go in late January, and he will now be available to be claimed by the rest of the league once again.

Megill earned the save in the Brewers' 9-7 win over the White Sox on Sunday, allowing one hit while striking out two in a scoreless ninth inning.

The Brewers bats rallied with a six-run eighth inning, and Megill was brought out for the top of the ninth for his first save opportunity of the season. He yielded a single to Tristan Peters before striking out the next two batters, and Megill came away with the save after getting Miguel Vargas to fly out to right field. Megill is looking to build off a solid 2025 regular season in which he collected a career-high 30 saves (eighth most in the majors) while posting a 2.49 ERA, 1.13 WHIP and 60:17 K:BB across 47 innings.

Mlodzinski did not factor into the decision in Sunday's 4-3 extra-inning win over the Mets, allowing two runs on six hits and no walks with eight strikeouts over 4.1 innings.

Mlodzinski threw 55 of 85 pitches for strikes and generated just eight whiffs while mostly keeping the Mets in check. The 27-year-old posted a career-high 99 innings last season working as both a starter and reliever, so he likely won't go deep into games often early in 2026. He's slated for a home matchup against the Orioles next weekend.

Beeter earned the save Sunday against the Cubs, throwing a clean ninth inning.

Beeter was locked in Sunday, firing each of his six pitches for strikes to nail down the save. The 27-year-old right-hander drew Washington's first save opportunity of the year, suggesting he's at the front of the line when it comes to the closer role. Cole Henry may be in the mix as well, but Beeter could push him back into a setup job with a strong start to the campaign.

Imanaga (0-1) took the loss Sunday against the Nationals, allowing four runs on six hits and two walks in five innings. He struck out seven.

The left-hander wasn't sharp to begin his season debut, as he was ambushed by Washington for three runs in the opening frame, but he was at least able to settle in a bit thereafter. Imanaga displayed plenty of swing-and-miss stuff as well, registering an impressive 16 whiffs Sunday. Imanaga will be trying to get back on track in his next scheduled outing, which is set come in Cleveland versus the Guardians next weekend.

Pagan earned the save in Sunday's 3-2 win over the Red Sox, allowing one hit and one walk in a scoreless ninth inning. He did not record a strikeout.

Pagan was summoned to protect a one-run lead in the ninth and worked around a one-out double to slam the door. It was an encouraging rebound after he allowed a homer and blew his first save chance Saturday. The 34-year-old could be unavailable Monday after throwing 34 high-leverage pitches over the past two days.