When was this asked? Brock is gone! He talked to Vince about returning, but has since, changed his mind, he isn't coming back for a very longtime, if ever. If you're talking about New Japan Lesnar's Debut, yes he won the title Brock Lesnar has held the following recognized World Championship ; IWGP Heavyweight Title(Japan), WWE Championship(3 times), and is also the current UFC Heavyweight Champion.
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Brock Lesnar fought Randy "The Natural" Couture to become the UFC Heavyweight Champion. The fight was at UFC 91 in November 2008 in which Lesnar defeated Randy by TKO in the second round.
Lesnar went on to defend his title twice more before losing it to the current champion Cain Velasquez. Lesnar retired in the year 2011 after his loss to Alistair Overeem due to health issues.
Yes. Brock Lesnar defended his title on September 22, 2014. He still remains the WWE World Heavyweight Champion.