#2 Another SummerSlam main event for Brock Lesnar
The one thing which is from common between the SummerSlam main events from 2014 to 2018 is the name, Brock Lesnar. Lesnar has been WWE's trump card for this pay-per-view since 2014.
He fought with John Cena in the main event of SummerSlam 2014, against Undertaker in 2015, Randy Orton in 2016, Samoa Joe, Braun Strowman and Roman Reigns in 2017 before he lost his Universal title to Roman Reigns at SummerSlam last year.
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Lesnar is most likely to cash-in his briefcase before the biggest party of summer and if he captures the Universal Championship, he will once again headline SummerSlam.
Also Read - Ranking 31 Years of WWE Summerslam Main Events (1988-2018)
WWE can book a rematch between Seth Rollins and Lesnar for the title but the WWE Universe would be happier if they also involve the Phenomenal AJ Styles in the mix.