Westfield junior Molly O’Sullivan scored a game-high seven goals in a 17-13 girls’ lacrosse victory over Centreville on Wednesday night.

With the win, Westfield (13-1, 5-0 AAA Concorde) capped an undefeated run through district play and clinched the top spot, and the accompanying first-round bye, in the district tournament that begins Friday.

But the regular-season title was secondary for the Bulldogs, many of whom grew up playing lacrosse with girls from Centreville.

O’Sullivan, who once played on a youth lacrosse team coached by the father of Centreville attackman Reagan Newell, scored the first two goals of the game for Westfield. She said she was nervous ahead of Wednesday’s game against Centreville (9-2, 3-2) and that winning was, “all I could think about all day.”

“I miss playing with them, I’m such good friends with all of them,” she added. “But just the fact that we’re not on the same team, the better you know them, the more you want to win for your pride.”

The Bulldogs opened the game white-hot offensively, ripping off six straight goals after allowing Centreville to score first. Slowly, the Wildcats crept back into the game, closing the half down by just two.

Westfield opened the second half just as it had the first, pulling away from the Wildcats by outscoring them 7-1 in the first 11 minutes after halftime. Centreville again tried to fight its way back into the game, but the hole proved too deep for the Wildcats to ever seriously challenge in the second half.

Caroline Wakefield was the top scorer for Centreville with six goals, followed by Newell who chipped in with five. Senior Carly Sane was the only other player who scored Wednesday night for Centreville.

“There’s all the emotions you could ever think of running through my body right now,” said senior Kate Manning, who was a freshman in 2010 on the last Bulldogs team to win a district championship. “It would be the ideal full circle ending for me. We have a young team and I would love to end this regular season, this district season, with that banner.”