 In April 2012 , Lesnar once again returned to professional wrestling , rejoining WWE after an eight @-@ year hiatus . Two years later , at WrestleMania XXX , Lesnar defeated The Undertaker to end his undefeated streak at the premier annual event . Lesnar has been managed by Paul Heyman throughout the majority of his professional wrestling career . He has headlined numerous pay @-@ per @-@ view events for both the WWE and UFC , including WrestleMania XIX , WrestleMania 31 , UFC 100 , and UFC 116 . In 2015 , an ESPN.com article referred to Lesnar as " the most accomplished athlete in pro wrestling history " . 
