UFC 158 : Preview MMA March 7, 2013 UFC UFC 158 : Promo featuring welterweight Champion Georges St. Pierre vs the last Strikeforce welterweight Champ Nick Diaz. Watch the fights Saturday March 16th 10PM/7PM ET/PT on PPV. Prelims on FX @ 8PM/5PM ET/PT and Facebook @ 6:35/3:35 ET/PT.
