Treinen tossed a scoreless inning with two strikeouts in his Grapefruit League debut Thursday.
The Nats' addition of Joe Blanton to the bullpen seemingly impacts Treinen less than Shawn Kelley, unless Blanton is added to the mix of possible ninth-inning options by manager Dusty Baker. The battle to open the season as the Nats' closer appears to be a four-man competition between Treinen, Kelley, Koda Glover, and Joe Nathan.