ATLANTA -- Daniel Salloi and Gerso Fernandes scored second-half goals and Tim Melia came up with several huge saves, leading Sporting Kansas City to a 2-0 victory over short-handed Atlanta.
The loss snapped United's eight-game unbeaten streak Wednesday night in a showdown between the two conference leaders in Major League Soccer.
United played the last 56 minutes a man down after goalkeeper Brad Guzan was given a red card for taking out Kansas City's Khiry Shelton just outside the penalty area as he broke in all alone on goal.
Rookie Paul Christensen, an emergency signee filling in for injured backup Alec Kann, made a big save shortly after entering but couldn't hold off a Sporting team with an extra player.