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Backed by home runs from Dani Nordyk in the first inning and Jenna DiLorenzo in the third, Amity High junior lefthander Katie Koshes struck out 15 and took a no-hitter into the seventh inning on Saturday night, as the No. 5 seed Spartans defeated No. 2 Lauralton Hall, 3-0, to win the Southern Connecticut Conference softball playoff title at West Haven’s Frank Biondi Field.

“Katie’s a big-game pitcher,” said Amity head coach Loren Purcell. “She likes to get the ball in situations like this.”

After walking the Crusaders’ Lindsey Spitz, the third batter she faced, in the first inning, Koshes retired the next 17 batters she faced.

Spitz got her team’s lone hit, a single to right, before Koshes struck out the final two batters to get the win.

Amity brought its record to 17-6 heading into the Class LL state tournament. The Crusaders, in their initial season in the SCC, fell to 19-4.

“We came in here with a game plan and didn’t execute it,” said Lauralton Hall head coach Amanda Acampora, an Amity graduate. “Katie was really on for them. She kept the ball up and away from most of our hitters.”

Nordyk drove a 2-1-count delivery from starting and losing pitcher, Hayley Congdon, over the fence in left center for her teams’ early lead.

DiLorenzo took a pitch to opposite way for a two-run homer to right center. Nordyk was on base at the time after she doubled. She was the only Amity player with two hits.

Congdon was relieved by Ireland Miessau, who went the rest of the way, striking out six and walking one.

“I was thinking about this game all-day long,” said Koshes, whose Amity team lost to Mercy, 4-0, in last year’s SCC final. “Once we got that early run, I felt very comfortable. We played great defense and hit the ball well tonight.”

It turned out to be a perfect day for Amity teams. The baseball squad defeated Fairfield Prep, 14-6, earlier for the sweep, an accomplishment that was last done by Spartan teams in 2004.