#2 AJ Styles vs Samoa Joe (WWE Championship)

WWE fans have wanted to see AJ Styles vs Samoa Joe since Joe was drafted to SmackDown Live. And this Sunday the match is finally happening. Although the buildup to this match hasn't been great, this could easily be the best match on the card.
I think WWE can do much more with this feud, it should be booked for long term. As a result, I don't see The Phenomenal One dropping his title to Samoa Joe.
Prediction: AJ Styles defeats Samoa Joe to retain his WWE Championship
#1 Brock Lesnar vs Roman Reigns (WWE Universal Championship)

Roman Reigns has been chasing the Universal Championship for years now. And it looks like he is finally going to slay the beast at SummerSlam. Brock looks set to leave WWE after this PPV.
Roman Reigns has a very good chance of winning the Universal Title. The only thing that could stop him from doing so is a 'cash in'. So it's very difficult to predict what WWE will do exactly.
Prediction: I think Roman Reigns will walk out of SummerSlam as the new Universal Champion.
Leave your predictions for the PPV in the comments below.