#5 Brock Lesnar vs Kurt Angle
This rivalry was the highlight of SmackDown for almost the entirety of 2003. This was when Monday Night Raw was home to Triple H's "reign of terror", and SmackDown was the show to watch.
The two Superstars acted as both babyfaces and heels at different points during the rivalry, but there was a period during the summer when both wrestlers had become the best of friends. Lesnar had beaten Angle at WrestleMania 19, and the two Superstars had hugged it out to end the show on a high note.
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Their newly formed friendship was the talk of the town, as WWE presented backstage vignettes showing Lesnar and Angle trying to one-up each other via light-hearted pranks. The duo was featured in a triple threat match at Vengeance 2003, with Big Show thrown into the mix.
The bout was contested for the WWE Title, with Angle winning back the championship. Lesnar and Angle's friendship became history on an episode of SmackDown when Lesnar betrayed Angle to join forces with Vince McMahon.