UFCMMA Fighting's Ariel Helwani and Dave Doyle take a closer look at the top storylines heading into UFC 157, including the main event tilt between UFC women's bantamweight champion Ronda Rousey and Liz Carmouche. UFC 157, which will take place Saturday night on pay-per-view starting at 10 p.m. ET, also features a co-main event of Dan Henderson and Lyoto Machida.
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