Former UFC heavyweight champion Brock Lesnar has announced his retirement from professional wrestling following his appearance at WWE SummerSlam this past weekend. He briefly flirted with a return to the cage a few years later before resuming his professional wrestling career, which began in 2000 with the developmental Ohio Valley Wrestling, leading to his 2002 debut with the WWE. “The Next Big Thing” made an immediate impact, but later left pro wrestling when the busy schedule and travel became unbearable. But the business and I still have fuel in the tank but Saturday for Brock Lesnar, that’s it. In addition to being an NCAA Division I heavyweight champ and UFC heavyweight champion, Lesnar is a 7-time WWE champion, a 3-time WWE Universal champion, and the 2002 King of the Ring.