Real Reasons Why Brock Lesnar Lost Universal Title to Roman Reigns at WWE SummerSlam 2018. After years of trying, Roman Reigns has finally won the WWE Universal Championship from Brock Lesnar. Brock Lesnar's year and half run as Universal Champion was not popular among many WWE fans but they are wondering the reasons behind Vince McMahon's desicion to take the championship off of Brock Lesnar. In this special top 3 I countdown the real reasons why Brock Lesnar lost the Universal Championship at SummerSlam 2018.