The game was delayed nearly two hours in the fourth quarter by rain. The Gamecocks were already in control by that then.
Clowney did not have a sack and finished with three first-half tackles. The Tar Heels' fast-paced offense wore him down and forced him to the sideline for several pit stops, yet he and the defense mostly hemmed in North Carolina. Shaw and Thompson put South Carolina up 17-0 in the opening quarter.
Shaw found Shaq Roland for a 65-yard touchdown on the game's third play. Thompson threw a 29-yard TD to Kane Whitehurst later in the quarter.
North Carolina continually played away from Clowney's side with short passes and quick runs. When the Tar Heels did come his way, left tackle James Hurst - an all-ACC player with NFL hopes of his own - did a solid job keeping No. 7 in check.
Davis finished with 115 yards on 12 carries. Shaw was 11 for 19 passing for 149 yards and his touchdown.
The Gamecocks looked like they might give their defense a break with a 17-point first quarter that was their biggest production in an opening-game quarter since 1996's 33-14 win over Central Florida.
The Gamecocks outgained North Carolina 203 yards to 35 in the opening quarter. The Tar Heels settled down a bit after that and closed to 17-7 on Renner's 4-yard TD pass to Quinshad Davis.
North Carolina, though, hurt itself several times. After the defense forced a three-and-out, T.J. Thorpe muffed the punt at midfield to keep South Carolina's drive going.
Elliott Fry added field goals of 39 and 26 yards in his first game at South Carolina.
Spurrier has said all summer that South Carolina is more than just Clowney. The Gamecocks defense certainly was, holding North Carolina's high-speed attack to 121 yards in the first 30 minutes. The Tar Heels averaged more than 40 points and 485 yards a game last year.
North Carolina opened the second half with a 17-play, 7-minute drive that ended with a field goal to cut the lead to 20-10. Then Davis, the younger brother of ex-Clemson 1,000-yard rusher James Davis, burst through the line on South Carolina's next snap and broke out for his long touchdown run.
The Tar Heels couldn't make anything happen after that.
Renner and the Tar Heels drove to South Carolina's 2 in the final two minutes, but could not score. Renner was stopped a yard short of the end zone by defensive tackle Kelcy Quarles.
Renner ended 26 of 43 with 194 yards. The Tar Heels finished with 293 yards.
The game was delayed with 8:20 left when lightning closed in on the stadium. Fans filed out quickly and hit their cars as heavy rain and thunder pelted the field for about an hour.