A 22-year-old Beloit man is facing charges after a serious traffic crash involving a stolen vehicle.  Rock County Sheriff’s officials say deputies were called to the intersection of West Rockport and South Hayner Roads about 6:00 a.m. Saturday for a two-vehicle crash.  Deputies found a Yukon Denali and Chevy Cruze overturned off the north side of the roadway.  Officials say the driver of the stolen Denali failed to stop at the stop sign and hit the Cruze.  A 22-year-old Janesville man was pinned in the car and suffered life threatening injuries.  The driver of the Denali was arrested on an outstanding Felony Warrant, but is expected to face additional charges.