Having become the first expansion team in more than a decade to qualify for the MLS Cup Playoffs, Seattle Sounders FC can now aim for home-field advantage - or even the top spot in the Western Conference - when they take on FC Dallas on Saturday night. For the visitors, it's even more of a must-win situation - they almost certainly will need a victory to keep alive their dramatic late-season charge toward a playoff spot, depending on the results of the other teams tied on 39 points entering the final weekend.Seattle Sounders FC became the fifth team to clinch a place in the MLS Cup Playoffs and the first expansion team to do so in more than a decade, coming back for a dramatic 3-2 win against the Kansas City Wizards at CommunityAmerica Ballpark on Saturday evening. Sounders FC have 44 points from 29 matches, still in fourth place in the Western Conference, but now just one point behind the division-leading Houston Dynamo, LA Galaxy and Chivas USA.FC Dallas continued their remarkable late season charge, winning for fifth time in six games in a 2-1 win against the Colorado Rapids on Saturday at Pizza Hut Park. FCD has 39 points from 29 matches, entering the final week in a four-way tie for eighth place overall and the final playoff spot.For me home win here.