Allie Walljasper didn’t need to worry about not having run support Tuesday.

She took care of that all by herself.

With one swing of the bat, LSU’s senior pitcher scored all the runs she needed to secure a win, launching a 273-foot grand slam into the left-field berm in the fourth inning of the Tigers’ 8-0 smashing of Northwestern State at Tiger Park.

That, combined with her 4⅔ innings of shutout softball in the midweek matchup, and Walljasper all but single-handedly ended LSU’s recent four-game skid.

“Tonight was just a big win,” Walljasper said. “It’s hard to come out after a lot of SEC (games) and come out during a midweek and try to show up. But everyone came yesterday, worked hard, got their swings in, got what they needed to be prepared today and it showed.”

It was the second career grand slam for the two-way player and her first since her freshman season — but Walljasper was more concerned with getting a win.

She did.

On top of what has become a routine performance in the circle — Walljasper (12-4) allowed just two hits and struck out three of the 18 batters she faced — Walljasper also sparked the LSU offense to a rare big inning — a feat potentially just as difficult as a grand slam this season.

LSU (33-10) was coming off three losses at Tennessee last weekend, and the Tigers have often struggled to bring runners home this season — but Walljasper produced the first runs in what became a six-run explosion in the fourth.

After Walljasper's one-out grand slam, it took just three more batters to re-load the bases. Emily Griggs followed with an RBI walk, and Amanda Doyle hit a sacrifice fly to center before the Demons could close the half-inning.

LSU sealed its victory in the next inning when Elyse Thornhill hit a single to the center-field wall, extending the lead to eight.

The Tigers would’ve also had another run when CC Caccamise crossed the plate on the final at-bat, but the game was called as soon as the Tigers hit the eight-run mark.

Tuesday was just the seventh mercy-rule win for LSU this season.

“Nice to get back to the positive side after a rough weekend and to get some confidence at the plate and see them swinging big,” coach Beth Torina said. “It was fun to see that. Fun to see Allie Walljasper have a great day. She’s a great person and I always like seeing her have good days.”

Freshman right-hander Shelbi Sunseri came on in relief of Walljasper to get the final out.

Follow Mike Gegenheimer on Twitter, @Mike_Gegs.