The last time was Manny Pacquiao, wo is supposed to face Spence but suddenly was replace by Ugas and obviously, Manny lost that fight already.
That was not the reason, whoever trained or coach Manny, he would not won in that fight because he said he has cramps on his legs that bothers him in the fight since he cannot use his quickness. Sometimes, boxers losses, it's just up to them how they'll recover from that loss.
It wasn't the whole reason why Pacquiao lost the fight against Ugas but I still believe that part of that reason why he lost is the sudden change of opponent which is Ugas because Spence can't fight because of the tear in somewhere in his eyes. That sudden change is a factor why Manny has lost because majority of the preparation he did was for Spence while Ugas was already training for Pacquiao if in case Spence can't make it, and it did happen.
Once a boxer trained hard for the expected opponent then for sure a chance of winning is very high but Like Pacquiao situation which a switch of opponents and instead of Spence, ugas take the opportunity to fight Manny Pacquiao which is Manny have only 1 week preparation for the upcoming fight to the new opponent which is very hard to study the fighting skills because of the shortage of time. Anayways back to the main topic which is the ramatch between ancajas vs Martinez maybe this time we can see the revenge punches from ancajas and take the victory.
No doubt, Ancajas will eventually redeem the belt and avenge his loss during their first encounter. This might be a bit personal for Ancajas because he loved that belt as he was trying to protect and hold that for years.
This time, there will be no excuse as long as there is no sudden change of boxer because of some issues. We can't really take out that factor because a change of foe will become a disadvantage as it's not the opponent you're preparing for, might be good if it will be announced much earlier but if it's just 1 week notice, I doubt that the result will be much different from the expectation.