Konrad, who made his MMA debut in 2010 and finished the year with a perfect record of 7-0, ran through Rogent Lloret, Damian Grabowski and Neil Grove during last season's Bellator tournament to win the heavyweight belt. At 27 years of age, Konrad remains a prospect in MMA off his accomplishments as a two-time NCAA wrestling champion with the University of Minnesota.
Buentello (29-13)'s last televised fight was a knockout loss to Tim Sylvia last August on pay-per-view. In December, Buentello bounced back with a decision over Kerry Schall at a show in the Dominican Republic.
Bellator 42 will also feature Richard Hale taking on D.J. Linderman and Tim Carpenter facing Christian M'Pumbu in the semifinals of the promotion's light heavyweight tournament.