There were some excuses on Pacman's camp on that lose, so Ugas has to prove that he really is a great champion and that is by beating Spence which again he is listed as the underdog in the sportsbook. I like Ugas discipline, he is so humble and you can tell he is really working hard to achieve where he is now, but in order for him to kill the doubts of the people on him, he needs to beat Spence, very simple.
The same way I see him. He seems more inspired and eager to win here as what a big recognition he can get if he was able to win the fight.
But in reality, being inspired, hungry, eager, etc. isn't enough to win the fight. It needs actual physical strength and I'm sure Ugas is already working on some strategies he can use against Spence Jr. However, on the other hand, Spence Jr. is also having the same way. No way he will just allow Ugas to control the fight as they have the same goal.