Brock Lesnar, 5-3 in the UFC, returns from a four-and-a-half year hiatus at the age of 38 to a sport that has drastically evolved since his last fight - which was his second consecutive TKO loss - to face a former K-1 kickboxer who has knocked out a who’s-who of top competition during the same time frame Lesnar has been play-fighting on a reduced schedule.