revision preference src: United opened the Major League Soccer regular season at home against Sporting Kansas City on March 10. Sporting Kansas City, the defending Eastern Conference regular season champions, defeated United at RFK Stadium, 1 -- 0 in United's final outing of the 2011 Major League Soccer season. <SEP> tgt: United opened the Major League Soccer regular season at home against Sporting Kansas City on March 10. Sporting, the defending Eastern Conference regular season champions, defeated United at RFK Stadium, 1 -- 0 in United's final outing of the 2011 MLS season.