D.C. United at Philadelphia Union

Where: PPL Park, Chester, Pa. When: 8 p.m.

TV: NBC Sports Network.

Records: United 3-15-4, 13 points; Union 9-7-7, 34.

D.C. probable starters: GK Bill Hamid; Ds Chris Korb, Dejan Jakovic, Daniel Woolard, James Riley; MFs Sainey Nyassi, Perry Kitchen, Jared Jeffrey, Kyle Porter; Fs Chris Pontius, Dwayne De Rosario.

Philadelphia probable starters: GK Zac MacMath; Ds Sheanon Williams, Amobi Okugo, Jeff Parke, Raymon Gaddis; MFs Danny Cruz, Brian Carroll, Sebastien Le Toux, Michael Farfan; Fs Jack McInerney, Conor Casey.

Outlook: United aims to continue an enjoyable stretch of a rough year following a league victory over playoff contender Montreal last weekend and an away upset of Chicago in the U.S. Open Cup semifinals Wednesday. “I got a feeling the last part of the season will be a lot different than the beginning,” MF Nick DeLeon said. “There is a good vibe going on right now. I haven’t felt that since the beginning of the season.” MF Luis Silva, who has scored in each of three league matches since being acquired from Toronto, did not practice Friday after suffering a head injury against the Fire. United is 0-7-3 in regular season road games with two goals for and 16 conceded. The Union, fourth in MLS’s Eastern Conference but just four points behind first-place New York, is 4-2-4 in its past 10 regular season matches. F Jack McInerney, 21, is fourth in the league scoring race with 10 goals. MF Sebastien Le Toux has an MLS-best 10 assists. The teams have met twice previously this year: a 3-2 Union victory in April at RFK Stadium and a 3-1 United triumph at Maryland SoccerPlex in the Open Cup in June.

— Steven Goff