KANSAS CITY, Mo. — Jamiro Monteiro and Sergio Santos scored two minutes apart midway through the first half.
Santos added a second goal just before halftime and the Philadelphia Union reached the semifinals of the MLS is Back tournament with a 3-1 win over Sporting Kansas City.
Philadelphia's perfect run in the tournament continued thanks to its first-half scoring blitz.
The Union had two wins and a draw in the group stage then beat New England in the round of 16. Philadelphia will face either New York City FC or Portland in the semifinals.
