Anderson Silva's days at being the middleweight champion may be numbered

If you saw UFC 136 Saturday night, Chael Sonnen called out Silva after running through Brian Stann. He told Silva in there rematch he wanted to put some stakes at hand, if Silva loses he will have to leave the middleweight division, but if Sonnen loses he will leave the UFC. Last time these two fought Sonnen beat up Silva for four and a half rounds, but was caught in a triangle choke at the end of the 5th round.

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