The Nationals were up 8-0 after two innings and cruised to a 13-0 win over the Pirates at PNC Park.
Matt Adams, who went to college at Slippery Rock, hit a two-run homer in the first on his way to a 3-for-5 night with four RBI.
Bryan Reynolds was the only Pirate to manage an extra base hit, hitting his 26th double.
Trevor Williams fell to 5-and-6, surrendering eight runs on six hits and three walks in just two innings.
The Bucs have lost three-straight.