Washington’s roster construction has often been criticized this season, as they don’t have a proven left-handed specialist out of the bullpen, they only have one true backup infielder (aside from Ryan Zimmerman, who can only play one spot), and four of their five outfielders are left-handed. Few of them, it should be noted, are hitting well.

They recently designated for assignment Hernan Perez - who checked off two of the boxes above - but he was unproductive in the batter’s box in his short time with the Nats. His pitching appearances, however, were entertaining.
In cutting ties with Perez, the Nationals opened up a spot on their 40-man roster. They aren’t required to fill it, but it does present them with an interesting opportunity to fill one of their glaring voids.
The option to promote someone from within is always available, but truthfully, there isn’t a worthy candidate. The few players they could recall from the minor leagues are already on the 40-man roster, anyway.
Strictly in terms of offense, Jonathan Lucroy is still available and could provide some value. However, as a third catcher, he doesn’t fix any of the larger roster conundrums.
Albert Pujols was also recently designated for assignment by the Angels, but the last thing the Nationals need is another first baseman. There are some other players in “DFA limbo” that present some intrigue, though. Left-handed reliever Brandon Waddell was chiefly among them as recently as early Saturday afternoon, but the Orioles beat the Nationals to the punch, claiming him from the Twins and optioning him to AAA Norfolk.