Okay, I got a response back from ACC Baseball (I tweeted them instead of email). Here it is:
"Top 10 overall, with the division winners getting the 1-2 slots, and 2nd place in each division guaranteed a spot."
That last part is a little confusing. There are only 7 teams in each division. Even if each of the 7 teams in one division finished with better records than the best team in the other division, you would still have 3 spots to fill in the tournament that would have to go to the top 3 teams of the other division.
Am I missing something? Somebody help me out here.
In any case, UNC baseball is in a bad spot as of this moment. They would be looking at some tie-break scenarios with GT and VT for the 10th spot if the season ended today.