The Undertaker controversially tops Brock Lesnar at WWE SummerSlam - SI.com

Lesnar, bleeding from the face, taunted The Undertaker as he made his way back into the ring and caught Lesnar by the throat with a choke slam, reversing the tides of the fight. The wily Undertaker then landed a vicious piledriver but Lesnar wriggled away. After several more minutes of back-and-forth, it appeared Lesnar had won after the bell rang and Undertaker had apparently tapped out. While Lesnar's manager Paul Heyman screamed in frustration, Undertaker snuck up and caught Lesnar unawares. The Undertaker made his return in July at Battleground, where he surprisingly appeared during Lesnar's match with Seth Rollins and sabotaged the fight, dealing Lesnar a kick to the groin and costing him the match. Lesnar and Undertaker actually teamed up early in Lesnar's career before battling in 2002 for the WWE Championship, which Lesnar won. Source: www.si.com