The Nationals were able to play out the first week of the season with just four starters, but they're going to call up Livan Hernandez tomorrow to take over as the fifth member of the rotation. Hernandez signed a minor league deal this offseason, so the Nats kept him off the roster until they absolutely needed the extra starter.
The team will have to clear a spot on the 25-man roster to call Livan up, but they do have an open spot on the 40-man roster, so that's not that problem. However, as MASNSports.com's Ben Goessling notes, relievers Tyler Walker and Jason Bergmann could be candidates for demotion, and both are out of options. They would have to clear waivers to head to the minors.
Walker, 33, signed a one year deal worth $650K this offseason, but he's allowed three runs in 3.1 innings on the young season. The 28-year-old Bergmann has appeared in two games so far, allowing a pair of runs in one inning of work. If the team choose to ignore the obviously small sample sizes, they could option 25-year-old Jesse English to Triple-A, who has allowed two runs in 1.2 innings of work on the season. Adam Kilgore of The Washington Post adds Miguel Batista's name to the mix, who's given up six runs in 4.1 innings so far.