5 greatest Brock Lesnar face-offs building up to big matches

#2: Brock Lesnar brawls with John Cena after getting slapped in the face (RAW, April 9, 2012)

Brock Lesnar returned to WWE after eight years away on the RAW after Wrestlemania 28, interrupting and attacking John Cena with an F5. The following week, the Face That Runs The Place returned the favor with an interruption of his own and a slap to the former UFC Champion. Lesnar, of course, could not take that lying down, and a scrap for the ages broke out.

The entire locker room tried to separate the two behemoths. But they kept on landing blows as chants of "Let them Fight!" broke out. The face-off ended with the 16-time champion grinning through his bleeding mouth at The Beast as Lesnar was escorted to the back.

The brawl was so entertaining that it became the first wrestling-related YouTube clip to exceed 100 million views.

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#1: Brock Lesnar confronts The Undertaker before their SummerSlam rematch (RAW, July 20, 2015)

Brock Lesnar broke the Undertaker's streak at WrestleMania 30. At Battleground 2015, The Deadman returned to cost Lesnar the World Heavyweight championship right when the latter had Seth Rollins pinned. The following night on RAW, as Paul Heyman addressed The Phenom's actions, he was interrupted by Taker. Lesnar soon joined the party, running out to meet the Prince Of Darkness in the ring.

The two legends fought each other and anyone that came between them, spilling the melee out to ringside and ending up backstage. As Lesnar and Undertaker were finally pulled apart, the former UFC Champion shouted "I'm gonna kill you," to which the Phenom retorted "You're gonna have to!"

The two had a match at SummerSlam 2015, which Taker controversially won.