Dallas' win last night over Chicago moved the Hoops to within two points of RSL in the MLS standings, each with two games to play.
The development is of interest to the Sounders who will (almost certainty) open the playoffs with an away-and-home aggregate-score series against the No. 3 finisher.
RSL's remaining regular-season games are tomorrow at Colorado and home against Portland on Oct. 22.
Dallas' remaining regular-season games are home to Vancouver on Saturday and at San Jose on Oct. 22.