#4. The best option for the SummerSlam main event

SummerSlam looks like it's going to be a pretty good card this year and obviously, they need a main event to draw interest despite the show being sold out in Toronto. There aren't too many great options this year for a main event, so it makes sense that WWE would want to go with Rollins vs Lesnar.
They may not have had a proper match, but you can be assured that this time around, it's going to last a lot longer than just a few minutes. Seth Rollins is going to take a beating like never before and if it is the main event, that might mean that we'll see a motivated Brock Lesnar take charge.
How Brock Lesnar ruined another wrestler's career - Watch Now!
Either way, Brock Lesnar is practically the king of SummerSlam with all the main events and big wins against The Rock, John Cena, Randy Orton, CM Punk, etc.
A top WWE star is missing in action