On StubHub. I'd hedge your bets and assume UK will be in the primetime slot in Louisville (2nd session).
Tickets are starting at $110 (which is for 2 games).
http://www.stubhub.com/ncaa-tournament-louisville-tickets/ncaa-tournament-louisville-3-19-2015-9034740/
Tickets are starting at $110 (which is for 2 games).
http://www.stubhub.com/ncaa-tournament-louisville-tickets/ncaa-tournament-louisville-3-19-2015-9034740/