Cena, 37, has 21 championship reigns, including a record 11 reigns as WWE Champion as well as three reigns as World Heavyweight Champion. Since debuting in the WWE in 2002, the 6'1", 251-pound pro-wrestler has the fourth-highest number of combined days as a WWE Champion behind Bob Backlund, Hulk Hogan and Bruno Sammartino, according to the WWE.
Love him or hate him (older fans love to hate him while younger fans love him), Cena has beaten just about everyone on the roster at least once. According to WWE.com, Cena's signature moves include the "Attitude Adjustment" and the "STF" (if you don't know what it means don't ask).
What truly sets Cena apart, though, is what he does outside of the ring. While it's easy to dislike John Cena the character for overcoming the odds so often that it's expected of him, it's very hard to hate John Cena the person. No matter how predictable and frustrating his character can be at times, Cena holds the record for granting the most wishes through the Make-A-Wish Foundation with more than 400 wishes granted.
In no particular order, here are John Cena's 10 biggest WWE rivalries.
1. Randy Orton
The picture shows Randy Orton and Cena at Monday Night Raw, Dec. 2, 2013.
3. Triple H
Triple H vs. Cena at Night of Champions, July 26, 2009.
5. The Rock
The Rock vs. Cena at Monday Night Raw, March 25, 2013.
7. CM Punk
CM Punk vs. Cena at Monday Night Raw, July 23, 2012.
9. Brock Lesnar
Lesnar vs. Cena, Extreme Rules PPV, April 29, 2012.
10. Shawn Michaels
Shawn Michaels vs. Cena at Monday Night Raw, Apr. 23. 2007.
--Written by Laurie Kulikowski in New York.