Breaking: TJ Dillashaw forced out of Renan Barao rematch at UFC 186 with rib injury

The upcoming UFC 186 pay-per-view (PPV) event -- which is set to go down on April 25, 2015 at the Bell Centre in Montreal, Quebec, Canada -- has suffered a major blow as bantamweight champion T.J. Dillashaw has been forced out of his rematch against Renan Barao with a rib injury.

Ultimate Fighting Championship (UFC) president Dana White revealed the unfortunate news earlier today (Tues., March 24, 2015).

The fight was to serve as the evening's main event, which means that Demetrious Johnson's flyweight title fight against Kyoji Horiguchi will be bumped up as the headlining act, while Quinton Jackson's long-awaited return to the Octagon against Fabio Maldonado will serve as the co-main event.

This is now the second time that a much-anticipated rematch between Barao and Dillashaw has been scrapped, as the fight was originally pegged to go down at UFC 177 last August, but was canceled after Barao fainted a day prior to the fight due to complications from the weight cut.

This isn't the first hit UFC 186 has taken, either, as a welterweight showdown between Rory MacDonald and Hector Lombard was unexpectedly pulled from the event after it was discovered that Lombard had failed his UFC 182 post-fight drug test.

And the rest, as they say, is history.