Claim: Brock Lesnar lost a fight against a K-1 kickboxer.
Evidence: Lesnar returned at UFC 141 in December , losing to Alistair Overeem and promptly retiring from MMA.
Alistair Cees Overeem -LRB- -LSB- ˈoːvəreːm -RSB- , -LSB- langˈoʊvəriːm -RSB- born 17 May 1980 -RRB- is a Dutch mixed martial artist and kickboxer.