North Putnam scored 16 runs in each of its two softball victories this season over Southmont.
Unlike the regular season win in five innings, Tuesday's 2A sectional semifinal had to go seven before it became official.
The Cougars scored in each of the first three innings and led 8-0 before Southmont plated two runs in the bottom of the third.
Kyndal Brewer recorded the win as she worked four innings in relief of starting pitcher Karyssa Miller.
North Putnam (19-9) will get a rematch with South Vermilion (21-6) in tonight's sectional championship. South Vermilion defeated the Cougars on May 18, 8-1. North Putnam has also been eliminated from the postseason by South Vermilion each of the last two seasons.