Former world heavyweight champion Tommy Burns, after he won the world heavyweight title, fought two men in one night and both bouts were billed as for the world heavyweight title...James J Walker and Jim O'Brien...boxrec states neither opponent had won a bout before their fights with burns that night.
and...Burns, defended his title twice in 88 seconds...once against Bill Squires (with James J Jeffries as referee) and once in Dublin, on St Patricks Day..against Jem Roache...the only time a world heavyweight fight was staged in Ireland.