WASHINGTON -- Pinch-hitter Grady Sizemore reached on a fielder's choice to drive in pinch-runner Ben Revere with a grounder to first for the tiebreaking run in the seventh as the Philadelphia Phillies beat the Washington Nationals 5-3 on Saturday.

First baseman Ryan Howard led off the inning with a walk and was replaced by Revere, who stole second and took third on a flyout to right. Revere then scampered home to beat a throw from first baseman Ryan Zimmerman on the ball hit by Sizemore to make it 4-3.

The Phillies added an insurance run in the ninth on a two-out single by center fielder Odubel Herrera -- his third hit of the game -- against reliever Blake Treinen to make it 5-3.

The Phillies (4-8) broke a six-game losing streak while the Nationals (5-7) lost for the first time in four outings.

Washington right fielder Bryce Harper had tied the game at 3 in the fifth with a tremendous solo homer to center. His fourth homer of the season and second in two days came on a 3-1 pitch from Phillies starter and winner Aaron Harang (2-1), who gave up three runs in six innings.

Freddy Galvis, the Phillies shortstop, gave his team a 3-2 lead in the fifth with a broken-bat, RBI single to left against Washington starter and loser Jordan Zimmermann (1-2), who struggled with his command for his second outing in a row.

Washington catcher Jose Lobaton had an RBI single in the fourth to tie the game at 2-2.

The Phillies scored two unearned runs in the third to take a 2-1 lead. Harang reached on an error by shortstop Ian Desmond and later scored on a single by shortstop Freddy Galvis. Herrera, who doubled and took third on the Galvis single, then scored on a fielder's-choice grounder off the bat of second baseman Chase Utley.

The Nationals had assumed a 1-0 lead in the first as center fielder Michael A. Taylor scored on a forceout off the bat of Zimmerman.

Desmond had three hits but also made his eighth error of the season that led to the two unearned runs in the third. Galvis had two hits for the Phillies, who scored just 13 runs during the losing skid.

Harang allowed two walks and six strikeouts before he was lifted for pinch-hitter Sizemore in the top of the seventh. Ken Giles pitched the eighth for the Phillies and closer Jonathan Papelbon went the ninth for his third save as he retired all three batters.

Zimmermann gave up four hits and four runs (two earned) with four walks and three strikeouts in 6 1/3 innings.

NOTES: Washington RHP Stephen Strasburg (0-1, 6.75) will face Philadelphia RHP David Buchanan (0-2, 11.42) in the series finale on Sunday. ... Nationals 3B Yunel Escobar was out of the starting lineup with a strained groin after he left Friday's game after he grounded out to end the fourth inning. Danny Espinosa made his first career start at third base for the Nationals on Saturday. ... Washington OF Jayson Werth was also out of the starting lineup for an off day after he played five games in a row after coming off the disabled list on Monday. ... Philadelphia CF Odubel Herrera has excelled as the leadoff hitter in his first big-league season. The Rule V draft pick from the Texas Rangers entered Saturday with an average of .257 in eight starts in center, with an average of .294 in 17 at bats against Washington. His three runs tied for the team lead.