Sporting Kansas City midfielder Cameron Duke (28) brings down the ball from the air during the U.S. Open Cup match against FC Dallas Tuesday at Children’s Mercy Park. Sporting tied it late and won 4-2 in overtime. NICK TRE. SMITH/AP
Examiner staff Sporting Kansas City manager Peter Vermes knew what he had prepared his team for wasn’t working at halftime of Tuesday’s U.S. Open Cup…