WASHINGTON (AP) There were no beanballs and no brawl, just another victory for the Baltimore Orioles, who completed a three-game sweep by beating the Washington Nationals 5-4 Thursday thanks to Matt Wieters' two-run homer in the eighth inning.

A night after Washington closer Jonathan Papelbon plunked Manny Machado in the ninth, leading Nationals star Bryce Harper to wonder aloud whether he might get hit with a pitch in retaliation, there weren't any obvious signs of animosity between the clubs.

Harper did not have his best day at the plate: He went 0 for 3, grounding into a double play and walking twice. The front-runner for NL MVP honors has gone hitless three games in a row for the first time this season.

More from FoxSports

Both clubs hold the slimmest of playoff hopes. Baltimore entered Thursday four games out of the second AL wild-card spot, while Washington began the day 6 1/2 games behind the NL East-leading New York Mets.

This was a makeup of a game postponed Tuesday because of rain, and the crowd was sparse and quiet - not just at the unusual 4:05 p.m. weekday start but throughout.

Baltimore went ahead 3-0 on Machado's RBI single in the first and Jonathan Schoop's two-run shot in the fourth But Wilson Ramos' homer and Yunel Escobar's pair of run-scoring hits helped the Nationals go up 4-3.

With Blake Treinen (2-4) on for the eighth as Washington's fourth pitcher, Steve Pearce singled and Wieters followed with his seventh homer, putting the Orioles out front for good.

Mike Wright (3-5) got two outs in the seventh for the victory. Brad Brach threw a scoreless eighth, and Darren O'Day pitched the ninth for his sixth save of the season and third of the series. Harper's groundout to Machado ended it.

Washington could have scored more in the seventh, but Anthony Rendon was thrown out at home by second baseman Schoop on a relay from center fielder Gerardo Parra. And in the eighth, Clint Robinson led off with a double but was thrown out at third by Wieters on Ian Desmond's attempted sacrifice bunt.

When Machado grabbed a liner to third that ended the seventh, he yelled, ''Come on!'' as he headed to the dugout.

Much of the pregame chatter centered on Baltimore's 4-3 victory Wednesday, when Papelbon hit Machado with a pitch, two innings after Machado delivered a go-ahead two-run homer off Max Scherzer.

After that game, Harper surmised: ''I'll probably get drilled tomorrow.''

Managers of both clubs tried to downplay such speculation Thursday.

''Retaliation? You're not supposed to do that,'' Baltimore's Buck Showalter said. ''The best retaliation would be to win another game, right? That's usually how it works.''

FOR STARTERS

Making his fourth career start, Orioles RHP Tyler Wilson went six innings, allowing two runs. Washington RHP Tanner Roark gave up three runs in five innings.

TRAINER'S ROOM

Orioles: CF Adam Jones (back spasms) was out of the starting lineup for the third consecutive game and had an MRI in Baltimore. ... LHP Zach Britton also had an MRI this week, Showalter said. ... For some extra outfield help, the Orioles selected the contract of OF David Lough from Triple-A Norfolk; he entered the game in the ninth. The team recalled RHP Dylan Bundy (strained right shoulder) from Double-A Bowie and put him on the 60-day DL.

Nationals: INF Danny Espinosa is ''likely done for the season'' because of a torn right hamstring, manager Matt Williams said.

UP NEXT

Orioles: RHP Kevin Gusman (3-6, 4.26 ERA) will start Friday's opener of a series at the Boston Red Sox, who will send LHP Rich Hill (1-0, 1.93) to the mound.

Nationals: Opening a three-game series against visiting Philadelphia, Washington will start RHP Jordan Zimmermann (13-8, 3.49) against rookie RHP Jerad Eickhoff (1-3, 3.16).