The last two clubs to win the Lamar Hunt US Open Cup will meet in Kansas City to determine who moves on to the semi-final round. Sporting Kansas City has been the better team in Open Cup play as they are 2-0 lifetime against Dallas. They thrashed them with a 6-2 scoreline (including four Dom Dwyer goals) in 2015 and beat Dallas 4-0 in 2004. Both of those years SKC went on to win the whole thing.
The problem is that those were different Dallas teams. 2004 is obviously a lifetime ago in MLS and the 2015 team featured a non-premium lineup.