MMA Fighting's Ariel Helwani and Mike Chiappetta take a closer look at the top storylines heading into UFC 158, including the main event tilt between UFC welterweight champion Georges St-Pierre and Nick Diaz. UFC 158, which will take place Saturday night on pay-per-view starting at 10 p.m. ET, also features a co-main event of Johny Hendricks and Carlos Condit.
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