It looks that in the case of tournaments, where all the fights were held in the same day, the order of the fights is random (or maybe not random, but anyway they are not ordered properly).
The example could be here: http://boxrec.com/list_bouts.php?human_ ... &cat=boxer where you have a boxer who, according to the record, started the tournament with the final bout, then fought 1/4-final and semi-final.