Poulin will serve as the Nationals' opening pitcher in Tuesday's game versus the Phillies, Kyle Williams of TheBanner.com reports.
Poulin is no stranger to opener assignments, as Tuesday will mark his 10th of the season. The southpaw has held lefty bats to a .173/.283/.346 batting line in 2026, so it makes sense to have him face Kyle Schwarber and Bryce Harper at the top of the Philadelphia lineup before turning the game over to righty Zack Littell, who will work in bulk relief.