PITTSBURGH - Matt Williams had said he planned on giving Jayson Werth and Ian Desmond a day off during this four-game series against the Pirates. Neither of those two players will be sitting in the series opener, however. Werth is starting in right field, hitting third, while Desmond is at short, batting fifth.

Blake Treinen makes his second big league start after officially being recalled from Triple-A Syracuse. He has a 0.77 ERA in four major league appearances coming into tonight. The Pirates will send right-hander Edinson Volquez (1-4, 4.71 ERA) to the mound tonight. At right, here's the picture of PNC Park that I promised. How great is that view? For the Nats CF Denard Span 3B Anthony Rendon RF Jayson Werth C Wilson Ramos SS Ian Desmond 1B Tyler Moore 2B Danny Espinosa LF Nate McLouth RHP Blake Treinen For the Pirates RF Josh Harrison 2B Neil Walker CF Andrew McCutchen 3B Pedro Alvarez LF Starlin Marte 1B Ike Davis SS Jordy Mercer C Chris Stewart RHP Edinson Volquez