You don't need to look further than the mound to find the best reason to watch tonight's game between the Nationals at Cardinals. Left-hander Gio Gonzalez goes up against Cardinals phenom Michael Wacha, who pitches against the Nats for the first time since Ryan Zimmerman broke up his no-hit bid last September. Wacha, 22, is 2-0 with a 1.89 ERA through three starts this season while Gonzalez is 2-1 with a 3.50 ERA. For the Nationals 3B Anthony Rendon LF Bryce Harper RF Jayson Werth 1B Adam LaRoche SS Ian Desmond 2B Danny Espinosa CF Nate McLouth C Jose Lobaton LHP Gio Gonzalez For the Cardinals 3B Matt Carpenter SS Jhonny Peralta LF Matt Holliday 1B Allen Craig C Yadier Molina 2B Mark Ellis RF Shane Robinson CF Peter Bourjos RHP Michael Wacha