Elvis scored 16 points to lead the Flyers, the Atlantic 10 favorite who was ranked No. 21 in the AP Top 25 before falling out this week. Dayton had its own offensive struggles, going 6 of 29 in the first half before warming up a bit to nearly 42% after halftime behind 14 points from Elvis.
But Dayton made just 4 of 27 3-pointers (14.8%) for the game.
Wisconsin led 23-14 at halftime.
The Badgers advanced to Thursday's semifinals to play third-ranked and reigning national champion Kansas, which beat North Carolina State in Wednesday's tournament opener. The Flyers will face the Wolfpack in Thursday's consolation bracket.
AP college basketball: https://apnews.com/hub/college-basketball and https://apnews.com/hub/ap-top-25-college-basketball-poll and https://twitter.com/AP_Top25