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LSU starting pitcher Zack Hess (38) pitches in an SEC game against Mississippi State, Thursday, March 28, 2019, at Mississippi State's Dudy Noble Field in Starkville, Miss. (Photo by Trevor Birchett/MSU Athletics)

COLUMBIA, Mo. — Junior pitcher Zack Hess left in the first inning of LSU baseball's game Friday night against Missouri with a groin injury.

After Hess threw his 13th pitch, coach Paul Mainieri and athletic trainer Cory Couture trotted to the mound.

"Is your arm OK?" Mainieri asked.

"I think I pulled my groin," Hess said.

Hess threw one practice pitch before walking off the field with Couture.

Hess injured his groin before the season, but Mainieri said Friday night's injury was unrelated. This one occurred in a muscle on the opposite side of Hess' groin.

"I don't know how long he'll be out," Mainieri said. "We'll have to see how that goes over the next few days."

Hess hit the first batter of the game and walked the second. He left in a 3-2 count.

Sophomore Ma'Khail Hilliard entered the game for Hess. Hilliard walked his first batter, loading the bases. Six runs scored before he recorded the first out of the inning.

LSU and Missouri poured on runs, tying the game 11-11 after six innings. LSU won in extra innings when Josh Smith slid head-first over home plate, scoring before Missouri tagged him.