Despite being 35 years old and carrying a four-fight losing streak with him, former heavyweight champion Frank Mir believes he can compete with the best.

Mir will face Antonio “Bigfoot” Silva Sunday night in the main event of UFC Fight Night 61 from Brazil.

After stringing together three consecutive victories over 2010-11 vs. the likes of Mirko Cro Cop, Roy Nelson and Antonio Rodrigo Nogueira, Mir was finished by Junior dos Santos three years ago.

That started a string of losses to Daniel Cormier, Josh Barnett and most recently Alistair Overeem.

“I took some time off,” said Mir, during a recent interview on UFC Tonight. “It was an easy solution. Close friends and training partners tell me the four guys I fought are highly ranked and tough, but I took some time off and addressed some things to be a better athlete and be at my full capacity.”

Mir (16-9) was the first person to defeat Brock Lesnar, doing so in 2008 via submission. He also scored a TKO victory over Nogueira later that year that earned him the interim UFC heavyweight title.

In Silva, the submission specialist knows he’ll be facing yet another ranked and tough foe.

“I think Bigfoot has a good counter right hand and long reach,” he said. “If you’re aggressive and take it to him, you can be successful. But if you let him off the hook, you’ll be unsuccessful.”