PHILADELPHIA -- Roberto Hernandez might want to have his next start switched, as well.
Chase Utley hit an RBI single in the first inning for the only run.
Hernandez (2-1) struck out three and walked three. His start was moved up two days because Cole Hamels had the flu, and he retired 14 of 15 batters in the middle innings.
"Not a big deal, whatever I had to do," Hernandez said. "I kept the ball down and tried not to overthrow. I'm happy. It was a great game for my team and for me, too."
Philadelphia manager Ryne Sandberg likes what Hernandez has added to the Phillies' rotation as the fifth starter.
"We like his stuff," Sandberg said. "He's a ground ball pitcher. He has a durable arm. He likes the ball. He's reliable and he can throw a lot of pitches in the game.
"I like the way he's throwing. He solidifies our rotation and is a good complement. He's funky out there, he's different and I like what he's doing right now."
Gonzalez (3-2) allowed four hits in 7 1/3 innings. He struck out seven and walked two.
"It was just a good pitchers' duel," Gonzalez said. "I just tried to keep us in the game as long as possible."
Philadelphia scored when Jimmy Rollins hit a one-out triple and Utley followed with a single.
"That set the tone for our game," Sandberg said.
"Gio pitched well and their guy did too," Nationals manager Matt Williams said. "It was a good, old-fashioned pitching duel."
Gonzalez got some help from his defense during that stretch, as Nate McLouth robbed Rollins of a hit with a diving catch in left field to open the sixth.
The slumping McLouth didn't have success with the bat, though, going 0 for 3. He has just four hits in his last 44 at-bats, and has been filling in for the injured Bryce Harper.
Adams, who gave up the lead and took the loss in Friday night's series-opening loss to the Nationals, got Jayson Werth to ground out. Bastardo then relieved and walked Adam LaRoche before striking out Anthony Rendon.
"We've had some really key hits over the course of the season," Williams said. "It just wasn't our day."
Said Gonzalez, "We're still good and the guys are working hard. I'm not worried about this team."
The Phillies unsuccessfully challenged a safe call by first-base umpire Fieldin Culbreth in the second. Culbreth ruled that Ian Desmond beat Rollins' throw from shortstop to first baseman Ryan Howard. The delay lasted 2 minutes, 42 seconds.
A former Phillies minor leaguer, Gonzalez dropped to 4-2 in seven career starts against Philadelphia at Citizens Bank Park. Gonzalez has a 2.00 ERA in the hitter-friendly ballpark. ... Howard went 0 for 3 with two strikeouts against Gonzalez, dropping him to 0 for 11 with six strikeouts lifetime against the Washington lefty. ... The Phillies host the Blue Jays for a short, two-game series beginning on Monday night when Toronto LHP J.A. Happ (0-0, 4.15) is scheduled to face Philadelphia RHP Kyle Kendrick (0-2, 3.52). Hamels is set to start Tuesday. ... The Nationals begin a three-game home series against the Dodgers on Monday night when RHP Jordan Zimmerman (2-1, 3.27) is scheduled to face Los Angeles RHP Zach Greinke (5-0, 2.04).