"I thought (Dirks) would compete, line up and pitch, but, boy, he made very few mistakes," LSU coach Smoke Laval said.
"I came out focused, got some run support and threw well," Dirks said. "Matt Liuzza did a heck of a job behind the plate for me, and the defense played great. You could not ask for more."
Dirks (2-0), a freshman left-hander from Hernando, Miss., limited the Green Wave to four hits, recording one walk and seven strikeouts. Only two Tulane runners advanced as far as second base, and Dirks retired 20 of the final 22 batters he faced.
Tulane starting pitcher Brian Bogusevic (0-2) took the loss, as he was charged with four runs on eight hits in 3.2 innings with one walk and one strikeout.
LSU grabbed a 1-0 lead in the third inning on consecutive singles by J.C. Holt, Matt Liuzza and Nick Stavinoha.
The Tigers scored four runs in the fourth as Holt provided a two-run double and Liuzza launched a two-run homer, his second this season.
LSU added one more run in the eighth when Holt produced his third RBI of the game with a single.
LSU's eight-game win streak is its longest since April 21-May 1, 2001, when the Tigers also won eight in a row.