Brock Lesnar is by far one of the most accomplished combat sports athletes of all time. He won the UFC heavyweight championship and the WWE World Championship, something no one else has been able to accomplish.
Aside from being 6’10” and over 300lbs, which would give you a fighting advantage by itself, The Undertaker is also a Brazilian Jiu-Jitsu black belt under Rolles Gracie.
Perhaps the most famous example of an MMA fighter turning to pro wrestling is Ronda Rousey. Rousey was a pioneer of women’s MMA and one of the biggest stars the sport had ever seen. Her fighting chops are undeniable and are backed up by the impact she made in the UFC.
Unlike many on this list, Wade Barrett does not have an extensive background in any formal martial arts. However, he was a British bare-knuckle heavyweight boxing champion before he became a pro wrestler
Ken Shamrock was actually and MMA fighter long before he ever became a pro wrestler. Shamrock was a pioneer of the sport, having legendary rivalries with Bas Rutten, Tito Ortiz and Royce Gracie. He even fought at the first-ever UFC event.
Bobby Lashley maintained a pro wrestling career while also having a wildly successful MMA run. He used his amateur wrestling pedigree from his time in the army to muscle his way to a 14-2 record in Bellator MMA, becoming one of their most popular fighters.
Jack Swagger was a college wrestling standout for the University of Oklahoma and on top of that has an undefeated professional MMA record of 3-0, mainly fighting in Bellator MMA.
Kurt Angle was a genuine Olympic Gold Medalist in wrestling. The wrestling machine has some serious chops in the grappling department, even incorporating legitimate wrestling moves into his arsenal in the ring.
Although ‘The Showoff’ might look more like a model than a fighter, he has a serious martial arts background to back him up. He was a high school wrestling standout who went on to set records for Kent State University. He was also teammates with UFC legend Gray Maynard.
Alberto Del Rio was actually an MMA fighter for a short time, with a professional record of 9-5 and winning many of his bouts via submission. He even fought in Pride FC which was a bigger promotion than the UFC at one point.