WASHINGTON - D.C. United's Jairo Arrieta and Sporting Kansas City's Dom Dwyer traded goals late in the first half in a 1-1 tie Saturday night.

Chris Pontius controlled Perry Kitchen's diagonal cross and stabbed it over to Arrieta for a quick left-footed strike in the 42nd minute that briefly put United (5-1-3) ahead.

Dwyer answered for Sporting KC (3-2-5) in the 45th minute with a smash from the middle of the 18-yard box, his third goal of the season. Dwyer also sent a header into the net off a free kick in the 62nd minute, but was caught offside.

United extended its undefeated streak to seven games in the lone meeting this season between the former Eastern Conference rivals.

Sporting KC re-joined the Western Conference this season to make room for expansion clubs Orlando City and New York City FC.