Former UFC heavyweight champion Brock Lesnar steps inside the squared circle tonight to challenge for the WWE title in the main event of SummerSlam.

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Lesnar retired from MMA after a loss to Alistair Overeem and returned to pro wrestling several months later.

The card also features Randy Orton vs. Roman Reigns, WWE Divas champion AJ Lee vs. Paige and Stephanie McMahon vs. Brie Bella.