Two veterans of the UFC heavyweight division will meet on Sunday night in Porto Alegre, Brazil, as Antonio ‘Bigfoot’ Silva faces former heavyweight champion Frank Mir, in what is arguably a must-win fight for both men. With Mir’s last win under the UFC banner coming back in December 2011, and Silva’s dating back to February 2013, the Brazilian crowd can expect to see two giants in the Octagon throw caution to the wind as they look to underline their relevance in the division. And Silva is especially keen to return to winning ways in front of his countrymen.