In the main event, former UFC heavyweight champion Junior dos Santos will square off against fellow UFC veteran Yorgan De Castro in a heavyweight contest. Dos Santos will be competing for the first time since his departure from the UFC in early 2021. De Castro won his Eagle FC debut in January with a first-round guillotine over Shaun Asher in 64 seconds.

'Bare Knuckle Fighting Championship 8: Silva vs. Gonzaga' was a bare-knuckle boxing event held by Bare Knuckle Fighting Championship on October 19, 2019 at the Florida State Fairgrounds in Tampa, Florida, USA. The main event of BKFC 8 is set to feature both UFC veterans and former UFC heavyweight title challengers, Antônio "Bigfoot" Silva vs Gabriel Gonzaga.