CINCINNATI -- Doug Fister pitched seven shutout innings and first baseman Adam La Roche delivered a two-run single, lifting the Washington Nationals to a 4-2 victory over the Cincinnati Reds in the finale of a three-game series on Sunday afternoon at Great American Ball Park.

The start of Sunday's game was delayed 16 minutes by rain.

Fister (10-2) allowed only three hits with one walk and five strikeouts over 104 pitches.

Washington (57-45) now leads the National League East by two games over the Atlanta Braves, who played Sunday night.

Cincinnati (53-51) has lost eight of nine since the All-Star break. The Reds were shutout for the 11th time, matching last season's total.

Reds starter Mat Latos struck out six through the first four innings. He got some defensive help in the fourth when shortstop Ramon Santiago made an over-the-shoulder lunging catch of left fielder Bryce Harper's pop fly to end the inning.

Second baseman Danny Espinosa's leadoff single in the fifth inning was Washington's first hit off Latos and it sparked a Nats rally.

The Nationals loaded the bases with two outs via a walk and a hit batter. Right fielder Jayson Werth walked to drive in the first run. LaRoche's two-run single put Washington ahead 3-0.

Latos exchanged words with home plate umpire Toby Basner about a borderline 1-2 pitch to Werth that was called a ball but would have been an inning-ending strikeout.

Latos (2-3) only allowed three hits, but he gave up three earned runs with four walks and hit a batter. He struck out six.

Fister, meanwhile, allowed a two-out single in the first inning then held the Reds hitless over the next five frames, retiring 12 straight in one stretch.

Third baseman Anthony Rendon's RBI single in the eighth produced an important fourth run for Washington.

In the ninth, third baseman Todd Frazier and right fielder Jay Bruce singled off Aaron Barrett to begin the inning. Rafael Soriano replaced Barrett, and catcher Devin Mesoraco doubled off the left-center field wall to drive in two runs, making the score 4-2.

Soriano retired the next three batters for his 25th save.

NOTES: Reds 1B Jack Hannahan was reinstated from the 60-day disabled list on Sunday and started at first base. Hannahan began the season on the DL following offseason shoulder surgery. "He's ready to go," said Reds manager Bryan Price. "He's still a work in progress to play third base from a throwing perspective. He'll help strengthen our bench." ... To make room for Hannahan on the roster, RHP Curtis Partch was optioned to Triple-A. ... Nationals GM Mike Rizzo signed Frank Thomas in 1989 while working as a White Sox area scout. Thomas was inducted into the Baseball Hall of Fame in Cooperstown, N.Y., on Sunday. ... Nationals 2B Danny Espinosa returned to the starting lineup after missing two starts. Espinosa is hitting .214 and ranks second on the club with 98 strikeouts.