UFC Bantamweight Champion TJ Dillashaw has suffered a fractured rib and his main event bout against Renan Barao has been pulled from UFC 186. A UFC Flyweight Title bout between champion Demetrious Johnson and Kyoji Hiroguchi will now serve as the main event. UFC 186 takes place on April 25th from the Bell Centre in Montreal, Quebec, Canada with Demetrious Johnson and Kyoji Horiguchi headlining.