10 Most Believable Underdogs In Wrestling Today

10. Rey Mysterio

Considered by many to be the greatest luchador of all time, Rey Mysterio has earned accolade upon accolade throughout his career, which has spanned over twenty-five years in American wrestling promotions. Whether plying his trade in ECW, thereby bringing lucha libre into the consciousness of American wrestling, becoming the face of WCW's now-legendary Cruiserweight division, or elevating himself into the ranks World Champions in WWE, the masked marvel has legitimately done it all.

After leaving WWE for a few years beginning in 2015, Mysterio was granted something he had not received in ages: time. It is well known that his flashy style had taken a toll on his body and that paper clips and the power of friendship essentially were all that held Mysterio together. Taken off the rigorous WWE travel schedule, nagging injuries seemed to heal and Mysterio was reborn, tearing it up in promotions like AAA and Lucha Underground. His return to WWE seemed inevitable.

Indeed, Mysterio came back looking, amazingly, better than ever. At 45 years of age, Mysterio moves around the ring like someone 15 years his junior, throwing down with the likes of Andrade, Samoa Joe, AJ Styles, and even receiving the highly coveted lose-to-Brock-at-a-PPV spot. Mysterio's size always means he's fighting from underneath, but his pedigree always has the fans believing he has a chance.