(David J. Phillip / AP)

Ross Ohlendorf makes his season debut for the Nationals. Ohlendorf (Princeton) is only the second player in Nationals history to hail from an Ivy League school, joining Mark DeRosa (Pennsylvania). He will oppose perhaps the Rockies best starter this season, Jorge De La Rosa (7-3, 3.38 ERA). The Nationals are 31-32, under .500 for the fifth time this season. The lineups are here. As always, discuss the game here.