#1 Brock Lesnar
Paul Heyman's client, Brock Lesnar, is a huge draw in the world of sports entertainment. Lesnar is also a huge draw in the UFC, where he is a former heavyweight champion. But although Lesnar is the "Beast Incarnate" inside the squared circle, he was a mere mortal on the football field.
In 2004 the farm boy from Minneapolis, Minnesota, decided that professional wrestling wasn't worth the hassle anymore, so he traded in his wrestling boots for football cleats. Despite not playing football since high school, Lesnar was determined to make it in the NFL. Many teams showed interest when Lesnar worked out at the combine, and he was clearly physically gifted enough to play as a lineman.
Signing with his home team Minnesota Vikings, Lesnar played through the pre-season but was cut. He was offered an invitation to play NFL Europe, but Lesnar, notorious for not liking to travel, declined.
This failed NFL endeavour may surprise newer WWE fans who have been bombarded with the praises and references to Lesnar's WWE and UFC success. It would certainly be hard for casuals to imagine Lesnar failing at anything other than the 30-day rule.