The Illinois product made 13 appearances last year out of the bullpen, posting a 2.04 ERA in 17.2 innings.
"Another left-hander that has command of three pitches," said Nebraska head coach Darin Erstad on Wednesday afternoon. "He really didn't have his velocity or command back last year, but both are coming around. I think there will be more velocity that comes back as he gets stronger, but the command is there.
"I think he has a little more confidence in his stuff. He's got more confidence in his arm."
The junior will be the first left hander since 2007 to make Nebraska's opening day starter. Hirsch is also slated to become the first Husker pitcher to make his first career start in a season opener since Michael Mariot in 2009 and before that, Shane Komine in 1999.
Hirsch was 17-5 in high school, posting a 0.99 ERA in three seasons at the varsity level. He struck out 175 batters in just 148.1 career innings.
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Information from the Nebraska Media Relations Press Release was included in this report