NEW YORK, NY - AUGUST 23:  Brock Lesnar and The Undertaker battle it out at the WWE SummerSlam 2015 at Barclays Center of Brooklyn on August 23, 2015 in New York City.  (Photo by JP Yim/Getty Images)
Steamboat vs. Flair
The classic rivalry between Ricky “The Dragon” Steamboat and “Nature Boy” Ric Flair began in February 1989, which led to three tremendous wrestling matches as they both contended for the NWA Heavyweight Championship. Even though the feud ended after WrestleWar, they met again for a string of thrilling matches under the WCW banner in 1994.
Daniel Bryan vs. Authority
WWE fans witnessed the overthrowing of tyrannical wrestling authority figures when the year-long feud between Daniel Bryan and The Authority ended in Bryan being crowned as the unified WWE Heavyweight champion in WrestleMania XXX. The feud was so great that it earned Pro Wrestling Illustrated's 2013 Feud of the Year award.
Misawa vs. Kawada
In the case of the Mitsuharu Misawa vs. Toshiaki Kawada feud — one that produced some of the most hard-hitting matches ever to take place between the ropes — legitimate professional tension went an especially long way in making their saga a sight to behold. As a result, it still holds a special place among wrestling's greatest rivalries.
Undertaker vs. Lesnar
Undertaker and Brock Lesnar's rivalry came to a head when they faced each other at WrestleMania 2014 and Lesnar pinned the Deadman, breaking his 21-0 streak. However, that wasn’t the end for Taker, as he would return to beat Brock in SummerSlam 2015, but lost their last match in Hell in a Cell, two months later.
Kevin Steen vs. El Generico
ROH workhorses Kevin Steen and El Generico’s tag team ended disastrously after Steen’s betrayal at Final Battle 2009, and after years of trading wins, their match at 2012 Ladder War was an all-out success. Under the WWE banner, they’d be renamed Kevin Owens and Sami Zayn and continued putting on good matches.