The Nationals have won the last 6 home games against the Reds, dating back to 2007.
And there aren't as many Reds on this team as in years past. Only Kearns and Dunn came from the Reds (Dmitri did as well, but is only on 40-man). Villone also played for the Reds, but that doesn't really count as he has played for 12 other teams as well.