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Chris Weidman's injury leaves Ronda Rousey fight as UFC 184 main event

Chris Weidman to miss UFC 184 because of a rib injury sustained this week during training

Ultimate Fighting Championship middleweight champion Chris Weidman on Friday pulled out of his UFC 184 fight against Vitor Belfort on Feb. 28 at Staples Center because of a rib injury he sustained this week while training.

Ronda Rousey’s fifth women’s bantamweight title defense, against No. 1-ranked challenger Cat Zingano, has been elevated to the main event.

The unbeaten Weidman (12-0) underwent a medical exam following the rib injury that established he couldn’t defend his title.

A UFC spokesman said there is no timetable for Weidman’s return.

Weidman suffered a training-camp knee injury last year after defeating former longtime middleweight champion Anderson Silva in December 2013.

Venice’s Rousey anchored a UFC card in her debut, beating Liz Carmouche at Honda Center.

She’ll be joined on the card by another contender, Holly Holm, a former kickboxing champion who’ll make her UFC debut in the new co-main event against Raquel Pennington.

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