The match will be at Toyota Field on May 28th at 7:30pm and will be the third straight time that the Scorpions have hosted the third round.
It would be the first time the Scorpions would face either of the two teams, who are playing each other in the second round for the second straight year.
Should NTX Rayados pull off the remarkable victory it would mark the first time the Scorpions would face a US Amateur Soccer Association club.
The Aztex will enter their second round match as heavy favourites, having won the same encounter last year and holding the PDL Championship.
The Aztex and Scorpions fans have a strong relationship, with both sets of fans often making the trip up or down I-35 to support the other, and as such a match up against each other is exciting.
There has long been speculation about the Scorpions playing a friendly against the Aztex, since the first season of both clubs but the conflicting seasons has made that organization difficult.
Making their first encounter a competitive match will certainly add some spark to the match, added to that both sides having a disappointing third round, where both were eliminated, should make for an interesting third round encounter.
The Scorpions will be putting two opposing streaks on the table in the match, regardless of which of the two teams qualifies, having never won a US Open Cup match at Toyota Field but conversely the Scorpions have not lost to Texas opposition in 2014.
The draw for the fourth round is yet to be made, but given the regional grouping of teams in the fourth round it is expected that the winner would play either Houston Dynamo or FC Dallas with the most likely opponent being Houston, a side that the Scorpions beat in a friendly earlier this year.
The fourth round draw will be made at a later date, and will be played on June 10-18, with a new format accommodating league play to avoid quick turn around times meaning the match may not necessarily, but will most likely, be a Wednesday.