AUBURN, Ala. — After watching LSU strike big in the first inning Friday night, Auburn turned the tables Saturday.

The Tigers used a four-run first inning to jumpstart an 11-7 win against No. 3 LSU at Plainsman Park in a game that was extremely similar to the one the night before.

The heart of Auburn’s lineup — Trent Mummey, Brian Fletcher, Hunter Morris and Tony Caldwell — combined to go 9-for-14 with nine RBIs, as the Tigers (21-11, 6-5 SEC) built an 11-4 lead before holding off a furious LSU rally in an error-plagued ninth.

“This win was huge,” Mummey said. “Looking back, last night we got down early and came back late. Last night we were talking trying to build some confidence ... and it definitely carried over.”

It was Auburn’s first win against LSU (26-5, 8-3) since 2007. The teams will meet in the series finale today at 2 p.m. ET.

LSU, which has won 16 of its last 17 SEC series, sends Joey Bourgeois (3-1, 5.50 ERA) to the mound. Auburn matches with Grant Dayton (4-1, 4.86 ERA), who finished serving a four-game suspension after being ejected last weekend for hitting an Alabama batter when both teams had been warned.

“Grant gets out of the penalty box, so he’ll be ready to go,” Auburn head coach John Pawlowski said. “The hard thing is he hasn’t been able to be here. He’s had to watch on TV or listen on the radio, so I know he’s anxious to get back here.”

Auburn, which trailed 6-0 before it stepped to the plate Friday night, jumped to a 4-0 lead Saturday off LSU starter Chris Matulis (5-1).

“I felt like (Friday) night, coming back a little bit and scoring a few runs, kept our confidence up,” said Fletcher, who had four singles and three RBIs. “Coming into today and scoring those four in the first was definitely big.”

Mummey, who is in his fourth game back from an ankle injury that cost him the first half of the season, added a two-run home run in the fourth that made it 6-1. He has three homers this week.

“Such a long time off, I was a little worried about recognizing pitches,” he said. “It’s just really come back to me a lot quicker than I thought it would.”

Matulis, who entered the game with a 2.57 ERA, gave up six runs and walked five in five innings.

“He pitched very similar to how he pitches normally,” LSU head coach Paul Mainieri said. “He just pitched against a better team today.”

Auburn got a boost out of its bullpen from reliever Sean Ray. Jon Luke Jacobs got the start but had to leave after an inning with a tender shoulder.

Ray picked him up by pitching 4 2/3 solid innings, his longest outing of the year. He kept LSU off-balance with a healthy dose of off-speed pitches, giving up two runs on five hits and striking out four.

“What a gutsy performance by our pitching staff today,” Pawlowski said. “We pieced it together and found a way to win.”

Auburn led 11-4 before three errors in the ninth helped LSU push three runs across the plate. They were Auburn’s first errors in nearly five games, but Austin Hubbard closed the door in his only inning of work, striking out Tyler Hanover with two runners on to end the game.

“I told our guys, every play, every swing, every runner left on base is so important,” Pawlowski said. “Against a good team, we were fortunate we had enough today.”