Brown is getting one final chance to get back on track in the UFC after suffering three consecutive submission losses in 2010. The Ultimate Fighter veteran began his UFC career with a four wins in his first five fights, but losses to Ricardo Almeida, Chris Lytle and Brian Foster last year have him on his last legs.
Attonito, who competed on season 11 of The Ultimate Fighter, hopes to bounce back from his first loss in the Octagon. After winning his first two fights in the organization, he dropped a decision to Dave Branch at The Ultimate Fighter 12 Finale in December.
UFC on Versus 4 takes place on June 26, though no official location or venue has been announced as of yet.