John Cena kicked off his legendary career 13 years ago. Surely you remember his debut match, but do you know what followed in his first month? More ACTION .\r<br>\r<br>John Cena has entertained WWE crowds for more than a decade, but WWE.com uncovered five surprising Cena facts, including his Attitude Era gym trip with .\r<br>\r<br>This Sunday, John Cena competes against perhaps his toughest opponent of all time: Brock Lesnar. WWE Top 10 looks back at Cenas rivalries over the years .\r<br>\r<br>Brock Lesnar is perhaps the most destructive competitor to ever step foot in a WWE ring. Hes also one of the most private. Now, uncover five surprising facts .
