UFC 133 is officially under way at the Wells Fargo Center in Philadelphia.
A light heavyweight title bout between Jon Jones and Rashad Evans was originally supposed to headline the card. But like a number of other scheduled fights, the Jones-Evans clash was scrapped due to injuries.
Instead, the resurgent Tito Ortiz will square off against Evans in the main event.
Middleweight Rafael Natal scraped out a victory in the opener, beating newcomer Paul Bradley by unanimous decision (30-27, 29-28, 29-28).
Nam Phan and Mike Brown are due up second.
More here all night. For the most up-to-date updates, follow me on Twitter @adamsmartschan .