Huntington North (21-7) answered right back, scoring twice in the bottom of the inning. Kaylynn Rosen's single drove in Cassy Lange, and Alyssa Hiple's double to left center field plated Rosen.
Chesterton (21-11) had runners in scoring position in the third, fourth and fifth innings but was unable to drive them in.
Hiple singled down the left field line to score Erica Friese with the Vikings' final run in the sixth inning.
Huntington North pitcher Erin Rethlake struck out 10 and walked two while giving up four hits.
“We kept telling them to take the first hittable pitch you need to see,” Chesterton coach LouAnn Hopson said. “Too many took the first one, then fouled off the second one, and we’re at mercy on the third one.”
Huntington North coach Paris Seibold said good defensive play was key to the Vikings' win.
“Our defense held together," Seibold said. "People are going to hit the ball at this level, and as long as our defense holds out, we’ll play pretty well.”
Chesterton's Megan Tymorek pitched a complete game, striking out six and allowing seven hits. She also doubled twice.
Sarah Richards and Mallory McKee had the Trojans' two other hits.
“Statistically, we knew they had power in their lineup,” Siebold said. “Tymorek and (Sydney) Cooley have some power. We knew we were going to have to hit the ball and score four or five runs to win. We were hoping they wouldn’t score too many off us.”