Cain Velasquez to undergo back surgery

Cain Velasquez to undergo back surgery

Recently [Cain Velasquez withdrew](https://www.bjpenn…

After a brief scramble that saw Nate Diaz offer to fight Anthony Pettis in the main event, the UFC promoted the co-main event bout between Johny Hendricks and Stephen Thompson to the main event, and moved the card to Fox Sports 1.

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