INDIANAPOLIS — Mike Tisdale scored 21 points and Demetri McCamey had 13 as fifth-seeded Illinois hung on for a 58-54 upset of No. 13 Wisconsin in Friday’s Big Ten tournament quarterfinals.The Fighting Illini (19-13) now face No. 5 Ohio State in Saturday’s semifinals. The Buckeyes advanced with a last-second 69-68 win over Michigan.Wisconsin (23-8) was led by Trevon Hughes and Jon Leuer, each with 14 points. Hughes led a frantic flurry in the closing minutes that got the Badgers in position to force overtime. But Jason Bohannon’s 3 with 15.9 seconds left clanked off the front of the rim, Mike Davis grabbed the rebound for Illinois and the Illini hung on.