#1 The Undertaker's Streak Comes To An End
While WrestleMania XXX had numerous standout moments, nothing comes close to Brock Lesnar defeating The Undertaker to break his 21-win undefeated streak at the PPV.
For almost a decade, the Undertaker's undefeated streak had become one of the main attractions of every WrestleMania. Almost all of the fans expected The Phenom to retire with his streak intact but WWE had other plans.
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After three F-5s, The Undertaker could not answer the three count and Lesnar was declared victorious. The crowd and millions of fans watching around the world were shocked to their core as no one expected that an established superstar like Brock Lesnar would be given the opportunity to break the streak.
Fans still question this decision and some have even said that this was the biggest mistake that WWE has made in recent history. This is not the most popular moment of the decade, but it is certainly the most memorable.