[1] When Diniz was 10, he started learning Capoeira, before switching in 2008 to Brazilian jiu-jitsu (BJJ) under coach Rodrigo Ranieri.

As a purple belt Diniz won silver during the 2012 IBJJF World Championship in the medium heavy division.

[1] On 16 September 2018, Diniz faced Craig Jones at the main event of Grapplefest 2 that was held in Liverpool, UK.

[16] He defeated Roberto Dib Frias 3–0 on points in the opening round before losing by submission to the eventual champion, Giancarlo Bodoni.

[18] Diniz then won the no gi super-heavyweight division at the IBJJF Nashville Fall Open 2023 on 12 November 2023.

[19] Diniz faced Nicholas Meregali in a superfight at UFC Fight Pass Invitational 6 on March 2, 2024.

[21] Diniz was originally scheduled to compete in the 2024 ADCC World Championship, but he withdrew from the event in order to enter the under 80kg division of the inaugural Craig Jones Invitational on August 16-17, 2024.