The Nationals announced that they designated right-hander Collin Balester for assignment to create roster space for left-hander Ross Detwiler. The move is a formality because Balester has more than three years of service time, according to Adam Kilgore of the Washington Post (Twitter links). Though the move technically vacates a spot on Washington's 40-man roster, Balester will be back on the roster later this week. 

Balester, 25, has a 4.61 ERA with an 11K/8BB ratio in 13 2/3 innings this season. In parts of four years with the Nationals, he has a 5.28 ERA with 6.8 K/9, 3.8 BB/9 and a 41% ground ball rate.

The kid used to have top prospect kinda billing, has a live arm, but has kind of gotten lost in the shuffle over there.  He is young, and doesn't appear to be injured.  Id be willing to part ways with an Adam Russell or Andy Sonnanstine for him...