Shelton vs. Thompson, Paul vs. Koepfer
A couple of all-seeded showdowns are set for quarterfinal Friday in Dallas, both of which include top American players. Ben Shelton is going up against Jordan Thompson and Tommy Paul runs into Dominik Koepfer.(7) Jordan Thompson vs. (3) Ben Shelton Shelton and Thompson will be going head-to-head for the third time in their careers when…