I read that Ugas is a feared boxer in the 147 lbs and no one wanted to fight him. So maybe this is a step up fight for Spence, and after his surgery it looks like he is back to have another challenge and their belts are on the line.
I do hope that the winner of this will fight Crawford for the unification. Hopefully it will be Spence as the hype has been building up for a Spence vs Crawford fight.
I think many people somehow underestimated Ugas (me included) when he faced Pacquiao on the ring. As much as that I was rooting for Pacquiao to win, maybe it was the latter's time to call it quits as he showed rusty on his fight. But we got to witness the destructive power and metal chin that Ugas had against his fight with Pacquiao.
Though Spence Jr. may be undefeated, I also do think that the fight will not be easy against them. If I were to bet, I would somehow bet my money on Ugas due to the talent he showcased against his fight with Pacquiao.
Maybe that's the correct word "underestimate". Not just Manny then, maybe all other boxers that he fought, and then suddenly they lost against him.
@harizen posted a good link, as they have one common opponent in Shawn Porter. Maybe Shawn really knows that he lost to Ugas in their fight because it was really hard to score that fight. That's why he thinks that Ugas has a good chance, maybe slim but still he may find a way to beat Spence.
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