A 26-year-old California man admitted Tuesday that he battered a man outside a Stateline casino last December so severely, the victim was left with shattered eye and jaw bones, and a knee injury.Zachary Maurice Peck of El Grenada, Calif., pleaded guilty to battery causing substantial bodily harm. He faces up to five years in prison, a $10,000 fine and restitution at his sentencing Dec. 4 before District Judge Dave Gamble."Regretfully, on Dec. 11, I got in an altercation that resulted in substantial bodily harm," Peck told the judge."That sort of implies the fight was mutual. What you pleaded to was …