So here we go:
Houston Dynamo (MLS) at FC Dallas (MLS): FC Dallas Stadium; Frisco, Texas; 7:30 p.m. CT
FC Dallas (MLS)/Charlotte Eagles (USL PRO) Winner at San Antonio Scorpions (NASL): Heroes Stadium; San Antonio, Texas; 7:30 p.m. CT
Charlotte Eagles (USL PRO) at Houston Dynamo (MLS): BBVA Compass Stadium; Houston, Texas; 7:30 p.m. CT
Interesting to note that Dallas would have to go on the road should San Antonio win their match with Houston. At least that is how it is tentatively planned - there have been a few games that have been moved to MLS venues for the third round after MLS clubs offered to pony up the cash to host them.
But the main point here is the fact that Dallas could be hosting Houston a week before the two meet in the regular season down in Houston - the only regular season match between the two sides this season.