Luke Donald sings at Wrigley Classic

Northwestern alum and PGA golfer Luke Donald stepped up to the mic to sing "Take Me Out to the Ballgame" during the Illinois-Northwestern game at Wrigley Field Saturday.

Donald stepped into the booth following the first quarter to lead the crowd.

Donald, who won the NCAA men's title for the Wildcats in 1999, gave a fine rendition of the Wrigley favorite, but elicited a mix of cheers and boos from the Illini-heavy crowd.