Romell Quioto and Mauro Manotas each scored twice, accounting for three second-half goals within 22 minutes, as the host Houston Dynamo overcame an early deficit to storm past Sporting Kansas City 4-2, sending the defending U.S. Open Cup champions out in the quarterfinals on Wednesday night.

SKC's Johnny Russell got the champs on the board first at BBVA Compass Stadium with a goal in the second minute. The lead held up for more than a half hour, until Quioto evened it up in the 35th minute. Twenty...