#4 Brock Lesnar vs The Undertaker (WWE No Mercy 2002)
WWE icon The Undertaker had several high-profile matches against Brock Lesnar during The Beast's initial run with the company.
Arguably the best-remembered match between the two superstars came at No Mercy in 2002.
After their match the prior month ended as a No Contest, a match between The Deadman and Lesnar was made for the WWE Championship inside Hell in a Cell.
The match was one of the most violent and bloody Hell in a Cell matches in WWE history, with The Undertaker bleeding profusely throughout the encounter.
Ultimately, Brock Lesnar was able to retain the WWE Championship after hitting his opponent with his trademark F5 finishing maneuver.
#3 Brock Lesnar vs Kurt Angle (WWE WrestleMania XIX)
Just 12 months after making his WWE main roster debut, Brock Lesnar competed in the main event of WrestleMania XIX when he faced off against Kurt Angle for the WWE Championship.
After dropping the title at Survivor Series, Brock Lesnar won the 2003 Royal Rumble match to punch his ticket to the main event of WrestleMania.
The match is perhaps best remembered for the closing moments that saw Brock Lesnar's professional wrestling career nearly come to a premature end.
The Beast scaled the turnbuckles to the top rope and attempted to hit a Shooting Star Press onto Angle who was half-way across the ring.
After a split-second hesistation, Lesnar attempted the move but landed directly onto his head. The nasty landing led many to speculate that the challenger had broken his neck, or at the very least had knocked himself out.
The Conqueror had the wherewithal to get to his feet and hit Kurt Angle with an F5 to win the match and capture the WWE Championship for the second time.