29-year-old Jim Henderson, called up by the Brewers earlier in the day, made his major league debut Thursday night, retiring all three Nationals he faced in his inning of work.
Henderson was a 10-year minor league veteran, having been picked by Expos in the 26th round of the 2003 draft. After he failed as a starter in low-A ball in 2005, the Nationals shifted him to the bullpen, where he's been ever since.