Barclays Center Twitter Account Possibly Spoils WWE SummerSlam Main Event?

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The official Twitter account for the Barclays Center in Brooklyn, New York may have possibly spoiled the main event at this Sunday’s WWE SummerSlam pay-per-view. This afternoon the arena tweeted out an announcement that Brock Lesnar will be live in person on Monday Night Raw next week.
Why does this potentially ruin Sunday’s headlining act? Well, not even two days ago Paul Heyman clarified that should the “Beast Incarnate” lose his WWE Univ