Terrion Ware beat Petr Yan as a +800 underdog early in my save. Yan has since gone unbeaten (avenging the loss to Ware in the process) and is now a top contender at 135 while Ware never won another fight for me and was released after losing 5 in a row.
I turned off fog of war to look at their stats after and it makes no sense that Ware won, I guess anything can happen in MMA after all haha.