Che Adams, a substitute, scored two times as the Saints came from behind to beat the Foxes.
James Maddison's free-kick, which was curled around the wall and into the bottom corner, gaveLeicester the lead.
The introduction of Adams changed the game for the Saints.
He scored from seven yards out after a long throw-in was missed byLeicester.
He only had to wait 16 minutes for his next goal after waiting six months for his last one.
Adams volleyed past Danny Ward after James Ward-Prowse lofted a cross into the box.
The youngest starting line-up named by any club since May last year, with an average age of 23 years and 238 days, was the one that helped propel Saints to their first victory of the season.
Hours before the game, Jamie Vardy signed a new contract, but he didn't touch the ball much.
Brendan Rodgers said that he wasn't in the right frame of mind when he was missing from the stands.
The decision to replace Mara with Adams in the second half could be vital for Hasenhuttl, who was under pressure after a run, stretching back to the end of last season.
Mara had a goal ruled out for a clear offside in the first half, when there weren't many chances for either side.
Maddison, making his first appearance of the season after recovering from a knee injury, dragged a shot just wide of the goal when he had a free- kick.
Things weren't looking good for the Saints when Maddison curled in a free-kick. The last goal in that run was against the Saints on the final day of last season.
They failed to deal with a throw-in before Adams put in the winning goal. James tried to stop the shot on the line, but he was able to help it in.
The Saints thought they had a penalty when Joe Aribo went to ground but he was booked for diving.
Adams scored the match winner with a beautiful volley after Kyle Walker-Peters had fed Ward-Prowse. Adams hit the post after scoring his second goal of the game.
The victory lessened the pressure on Hasenhuttl, but increased it on Rodgers, who has lost five points from winning positions this season. The last time they didn't win in their first three games was in the year 2015.
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