By how it looks Spence is the favorite, it's going to be assumed he'll beat Ugas. It's interesting though that Porter had it in mind that Ugas will find a way. From the link of harizen, someone in the comment actaully said that Ugas has an exceptional amateur career where he beat up Terrence Crawford and Danny Garcia which I also couldn't find the record anywhere. The one that I found was Crawford was beaten by Ugas in the Semifinal which is here https://boxrec.com/media/index.php/Terence_Crawford
There's a huge difference between fighting in amateur and fighting on the professional level, Tyson was beaten by Tyrell Biggs in their amateur days so when they faced when they are professional Tyson punished Biggs for beating him in their amateur days, it's wherein the professional where you will become a polished boxer and take your potential to the limit, so even if Ugas beat Spence and Ugas in their amateur days, it has no bearing now if they fight, so in this fight, I'll go for Spence he is a more polished boxer and a great executioner.