Question: What number best regional university in the South did the 2017 U.S. News and World Report guide rank the school where 2009 Atlantic Sun Conference Baseball Tournament was hosted?
Sentence (from "2006 Atlantic Sun Conference Baseball Tournament"): Stetson won its sixth tournament championship, and second in a row, to earn the Atlantic Sun Conference's automatic bid to the 2006 NCAA Division I Baseball Tournament.
Relevant evidence: No