BATON ROUGE, La. -- LSU rode a time-consuming drive, a huge turnover and freshman Jeremy Hill's back-breaking 50-yard touchdown run to a big fourth quarter, and the ninth-ranked Tigers toppled third-ranked South Carolina 23-21 Saturday night in front of a full and rowdy house at Tiger Stadium.
Down 14-10 after the teams swapped third-quarter touchdowns, the Tigers got the ball at their own 23-yard line late in the third quarter and started grinding away at the Gamecocks' normally sticky defense.
Hill, who rushed for a career-best 124 yards and two TDs, ignited the drive with a 19-yard burst, and junior Spencer Ware converted three third downs with bruising runs as LSU (6-1, 2-1 SEC) gobbled up 7:57 on 16 plays.
The drive finished with a 20-yard field goal by Drew Alleman that cut the Tigers' deficit to 14-13.
The South Carolina offense was rusty by the time it got on the field, and quarterback Connor Shaw showed as much when his third-down pass sailed high, and Eric Reid picked it off.
Reid returned the interception 29 yards to the Gamecocks' 22 and after Ware pounded out another first down with an 11-yard run, LSU was content to run three safe running plays and set Alleman up for a 22-yard go-ahead kick with 6:37 to go.
The Tigers' defense was suffocating all night, never more so than on South Carolina's ensuing series when Barkevious Mingo sacked Shaw for an 11-yard loss on third down to force a punt.
LSU got the ball at midfield on the exchange, and Hill provided the dagger when he ran through a gaping hole on the right side, cut back inside and found daylight in the secondary for a 50-yard score.
The Gamecocks closed the gap to the final score with a rapid 77-yard TD drive that ended with Shaw's 1-yard strike to Bruce Ellington. LSU held on the final series when Craig Loston came up with a second interception.
The second half was a back-and-forth battle as the LSU offense suddenly found a comfort zone and moved the ball well at times.
Down 7-3 at the half, the Tigers rolled down the field on the first series of the third quarter, driving 69 yards as Zach Mettenberger hit passes early in the drive and then let LSU's two bulky power backs finish it up.
Hill did that when he crashed through a tackle on a toss play and bulled in for a 7-yard score.
Just like the week before, LSU jumped in front with a field goal on its opening series, but that itself was maddening and typified another 30 minutes of offensive football.
After the Tigers stuffed South Carolina on the first series and forced a three-and-out, LSU's maligned offense came out clicking.
Running almost exclusively from the I-formation, the Tigers methodically pecked away at the Gamecocks' defense, with Ware grinding away and Mettenberger getting time to complete 4-of-5 passes for 42 yards.
After carving out only one third-down conversion in 13 tries last week, LSU converted four consecutive third downs. That streak ended when Kenny Hilliard was met at the goal line by safety Victor Hampton on a lead play from the 2-yard line and then dumped inches away from a touchdown by linebacker Reginald Bowens.
LSU coach Les Miles initially sent the field-goal unit out, but he then called his second timeout of the drive and sent the offense back out with Ware at quarterback. Ware snuck in for the TD, but right tackle Vadal Alexander was flagged for a false start.
That prompted Miles to send Alleman out for a 22-yard field goal that capped a 16-play, 69-yard drive that consumed 7:47.
South Carolina's offense struggled on its second series as well and had to punt, with the Tigers taking possession at their 42-yard line. A third-down screen pass to Hill on third down got LSU into Gamecocks territory, but two plays later Shaw rifled an ill-advised slant pass toward Jarvis Landry. Cornerback Jimmy Legree jumped the route, picked the pass off and rambled 70 yards on the return to the 1-yard line.
After the Tigers stuffed Marcus Lattimore for a 2-yard loss on the last play of the first quarter, South Carolina grabbed the lead when Shaw rolled right out of the spread formation and flipped a 2-yard pass to Ace Sanders in the end zone.
LSU got two chances to draw closer or regain the lead, but its two second-quarter possessions came up frustratingly empty.
The first was a 12-play march that got as close as the Gamecocks' 15. But no gain on first down and two incompletions forced an Alleman field-goal try from 33 yards, and he was wide left.
Then right after another South Carolina three-and-out, the Tigers were driving after a Mettenberger-to-Landry pass for 16 yards and a 14-yard Kenny Hilliard pickup on first-and-15.
Needing just a yard for a new set of downs, Hilliard was stacked up for a 2-yard loss and then went backward another yard on third down to force a punt.
Anchored by two long drives, LSU outgained the Gamecocks in the first half, 178 yards to 69 and were 7-of-10 on third-down conversions. Lattimore was limited to 25 rushing yards on 10 carries and Shaw was sacked twice.
NOTES: Ware was taken to the locker room after his sneak from inches away and didn't get back into the game in the first half. He had 47 yards on the Tigers' opening series -- 20 rushing and 27 on a middle screen pass. He returned in the second half and finished with 55 rushing yards. ... LSU was without three offensive line starters from the first game of the season -- left tackle Chris Faulk (out for the year with a knee injury), right guard Josh Williford (concussion last week) and right tackle Alex Hurst (personal problem). That led to a right side of the line with redshirt freshman Trai Turner making his first career start and true freshman Alexander making his third. ... Another true freshman, Lamar Louis made his first career start at strong-side linebacker. ... Saturday was the second week in a row South Carolina played in a matchup of top-10 teams (beat No. 5 Georgia 35-7), but only the sixth time in program history.