KNOXVILLE, Tenn. — Sindarius Thornwell scored 22 points Wednesday as South Carolina defeated Tennessee 70-60 for its third straight victory. South Carolina (13-3, 3-0 SEC) is off to just its second 3-0 start in Southeastern Conference competition since joining the league in 1991-92. South Carolina had a 3-0 start to league play in 1996-97 and