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BATON ROUGE, La. (AP) - The Hilltoppers (6-2) were as close to the Tigers as 17-13 on Brandon Doughty's 39-yard touchdown pass to Antwane Grant in the third quarter, but LSU scored the next 17 points.
Dupre caught a 55-yard scoring pass on LSU's opening series. Tigers freshman Tyron Johnson made a tough downfield catch over defender Wonderful Terry, then scampered about 20 yards for his 61-yard score in the third quarter. Travin Dural, who had five catches for 132 yards, caught a 17-yard touchdown in the fourth quarter.
''Because they run the ball so well, they could hit some play action off of it and they did,'' Western Kentucky coach Jeff Brohm said.
Doughty, who came in averaging 387 yards passing, finished 37 of 61 for 325 yards and three TDs. He was intercepted once, by Jamal Adams - the LSU safety's third interception this season. Taywan Taylor had 10 catches for 103 yards and one TD for Western Kentucky.
''It wasn't ideal. We're a throwing team, so when it's raining cats and dogs, it's a little tougher than a light sprinkle,'' Brohm said. ''We couldn't take as many up-the-field shots as we normally do.''
LSU finished with 211 yards rushing, well below its average of 325.5 yards coming in. Derrius Guice wound up with the Tigers' longest run - a late 47-yard touchdown dash.
After opening with four Fournette rushes for 15 yards on its first series, LSU took a 7-0 lead on Harris' deep throw to Dupre.
Yet LSU stuck with running plays for most of the first half with less success than usual, gaining just 82 yards on 23 carries.
Western Kentucky, which came in averaging 535.4 yards and 44 points, could not move the ball at its usual pace against LSU's defense, but managed to tie the game on its fifth possession. D'Andre Ferby broke loose for a 35-yard run, setting up Anthony Wales' 7-yard touchdown on a shovel pass.
Harris attempted only nine passes in the first half, completing four. However, one of those completions went for 67 yards to Dural, setting up Darrel Williams' 2-yard run that gave LSU a 14-7 lead at halftime.
LSU place kicker Trent Domingue, who scored a touchdown on a fake against Florida a week earlier, went back to his usual routine, hitting a pair of field goals to make him 9 of 9 this season. His second, from 43 yards made it 20-13.
Harris set up Fournette's 1-yard TD by completing a 25-yard pass to Dupre moments before he was leveled by linebacker Dejon Brown. Brown was flagged for targeting and ejected.
Western Kentucky finished with 428 yards, more than 100 yards below its average coming in, while LSU racked up 497 yards.
LSU's defense, which sacked Doughty just once after recording 17 sacks in its previous six games, wasn't entirely happy with its performance.
The Tigers played without starting defensive tackle Christian LaCouture, who was injured in practice (his status against Alabama remains uncertain), but defensive end Lewis Neal asserted, ''Regardless of who is out there, we just have to all keep pushing as a defensive unit. We have to try and continue to create more pressure.''
