First, Big John shouts "Let's get it on!" and the two come out and touch gloves to begin round 1.
Serra then immediately rushes St. Pierre and man hugs him [Otherwise known as the clinch], pushes him up against the cage, and tries to take St. Pierre down.
St. Pierre rejects his feeble takedown attempt and delivers some heavy foot stomps of his own, giving Serra a taste of his own medicine [Ha ha]. Serra is hurt and pushes St. Pierre away, only to be greeted by a spinning backfist [St. Pierre saw how effective this was against Serra during TUF4 so he got Shonie Carter (aka Mr. International) to teach him how to execute this move to perfection].
Joe Rogan then screams "Oh my god, he's rocked!" and Serra then stumbles and falls to the ground. St. Pierre then jumps on his prey [He smells blood!] and starts punishing him with hammerfists.
Serra, unable to defend against this fury of attacks knows that Big John will stop the fight unless he can defend himself "intelligently" so he turns around and gives St. Pierre his back. St. Pierre then works Serra over a bit to finally get the chokehold in place and submits Serra with a rear naked choke for the victory.