#1 Brock Lesnar
Regarded by many as one of the most decorated athletes in combat sports history, Brock Lesnar has held championships in amateur wrestling, Mixed Martial Arts and of course, Sports Entertainment. A former NCAA Heavyweight Champion, Lesnar defeated The Rock at SummerSlam 2004 to become the youngest WWE Champion in the company's history at the age of 25, a record that still stands to this day.
After leaving WWE following his loss to Goldberg at WrestleMania 20, Lesnar would ply his trade in New Japan Pro Wrestling where he would win the prestigious IWGP Heavyweight Championship in his debut match before leaving the industry to pursue a career in Mixed Martial Arts. Lesnar returned to WWE on the RAW after WrestleMania 28 in 2012 confronting John Cena and laying the Cenation Leader out with an F5.
Lesnar is one of the most protected stars in WWE. Lesnar's Universal Championship reign was one of the biggest reasons for the company's TV rating tanking to an all-time low. But, the company seems adamant on having Lesnar as the top star on the red brand. Lesnar winning the Men's Money In The Bank Ladder Match was another example of the company's reliance on the former Universal Champion. At this point, it doesn't seem like The Beast drives ratings anymore, it might have been the case in 2014-15 but in 2019, fans have grown tired of seeing Lesnar as a champion.