#6 Brock Lesnar vs Chris Benoit - WrestleMania 19

As early as December 2002, the main event of WrestleMania 19 was soon to be Royal Rumble winner Brock Lesnar challenging Kurt Angle for the WWE Championship.
However, Kurt would suffer yet another neck injury in February 2003 and needed surgery. The plan was made for Brock Lesnar to defeat Paul Heyman in a Steel Cage match on Smackdown, which he did, to earn an early Championship match with Angle the following week, Kurt was to then drop the Championship to Brock in a very quick and as painless as a possible match.
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Kurt revealed in an interview last year that just days before the Smackdown taping, a young neighbour fan of his with Down syndrome told him how excited he was for the match and Kurt changed his mind and wrestled Brock in the main event at WrestleMania as originally planned.
When the belief was that Kurt couldn't compete, WWE planned on having Chris Benoit win a number one contender's match to face Brock in the main event for the Championship.