Matt Besler scored in the 54th minute to help Sporting Kansas City earn the top seed in the Eastern Conference with a 1-0 win over D.C. United on Saturday.
Sporting (13-9-12), which closed the season with a five-match unbeaten run, will play in a two-leg conference semifinal against the higher remaining seed from next week's wild-card round.
United, eliminated from playoff contention with a draw against Portland last Wednesday, finished 0-5-1 in its last six matches.
RAPIDS 2, WHITECAPS 1: Wells Thompson scored in the 84th minute and visiting Colorado rallied for to beat Vancouver in the teams' regular-season finale.
Defending champion Colorado (11-9-13) improved its chances of hosting a playoff game, pending other results this weekend.
Vancouver (6-18-10) closed its inaugural MLS season and was playing under coach Tommy Soehn for the last time. Martin Rennie will take over next season.
REVOLUTION 2, TORONTO FC 2: Danny Koevermans scored in the 83rd minute to lift Toronto FC to a draw with visiting New England.
The Dutchman scored his eighth goal in 10 games this season.
Forward Nick Soolsma opened the scoring for Toronto (6-13-15), which gave up a league-worst 59 goals.
Midfielder Monsef Zerka and forward Milton Caraglio scored for New England (5-16-13).

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