Here is an article from Cincinnati.com which explains Xavier's scenario's for getting the 3 seed. It was before the Villanova game, but with the loss there is only 1 scenario where they don't get the 3 seed and that is if Providence wins.
http://www.cincinnati.com/story/blogs/2014/03/06/xavier-bidding-for-third-seed/6121927/From the article:
The good news is that the Musketeers will finish with a third or fourth seed, regardless of what happens down the stretch. Even better news: XU wins every tiebreak in every scenario except one.
The Musketeers are tied with Providence at 10-7 in league play. The Friars' lone remaining game is Saturday at 8 p.m. vs. No. 13 Creighton in Omaha. If Xavier loses to Villanova and Providence beats Creighton, then the Friars are the third seed and XU is the fourth.
The fourth seed plays the fifth seed at 2:30 p.m. next Thursday and the winner will likely face the top seed in the semifinals.
Big East associate commissioner for sports media relations John Paquette helped clarify other scenarios Xavier would win.
* If Xavier and Providence both lose their finales and fall to 10-8, you have to include the winner of Saturday's noon St. John's-Marquette game in Wisconsin. If SJU wins and creates a three-way tie, then Xavier is the No. 3 seed because of its 3-1 record against Providence and St. John's.
* If Marquette wins, it creates a different three-way tie. All three of the tied teams (XU, Providence, Marquette) would be 1-1 against each other so you have to find a difference by starting at the top. Villanova would be in first. Xavier and Providence would not have a win vs. the Wildcats, but both have defeated Creighton. Moving on down, Xavier is 3-1 against SJU and Georgetown and Providence is 2-2, so again the Musketeers claim the third seed.