sentences:  The last heavyweight 15-rounder title fight was on October 16, 1987 between Mike Tyson and Tyrell Biggs.The last middleweight 15-rounder title fight was a World Boxing Board title match on June 7, 1997 in which Jose Alfredo Flores won a split decision over Eric Holland in Ruidoso, New Mexico.In recent years, there have been calls to return the championship distance to 15 rounds.