SCARBOROUGH — With wet, cold, miserable weather at the start and worse conditions on the way, scoring first was even more important than usual.

“We just knew that we had to go out there and score one quick one and we just needed to put them away, so that first goal, when we scored that, was a huge boost for us,” said Scarborough midfielder Maddie Chen.

Chen got the first goal nine minutes into the game and second-seeded Scarborough added three before third-ranked Marshwood scored late in the Red Storm’s 4-1 Western Class A semifinal victory Saturday.

Scarborough (14-1-1), the 2010 and 2012 state champ, will play in its fourth regional final in the last five seasons against No. 1 Windham or No. 4 Thornton Academy. That semifinal was postponed until Monday. Scarborough tied Windham and beat Thornton this season.

Both Chen and defender Sam Sparda scored twice.

Chen’s game-opener came when she ran down a poor clearing kick by Marshwood keeper Emily Robida, who was under pressure from Katherine Kirk.

“It takes some of the pressure off of you, and the way we got it, kind of a bang-bang play, Katherine pressuring the goalkeeper and Maddie not just blasting but settling the ball and placing it in the net, made us relax a little bit,” Scarborough Coach Mike Farley said.

Sparda’s header of Ashley Gleason’s free kick chip put Scarborough ahead 2-0 with 16:32 left in the first half.

“Usually I take the free kicks but Gleason is really good at dropping them in,” Sparda said. “So we had her take that one. (Coach Farley) is all about putting a head on set pieces.”

The goals were Scarborough’s only two shots on goal in the half.

“We played before and it was a much better soccer game,” Farley said. “Both teams had possession. This game, it was like who could will it in the goal, and that was kind of the difference. The game wasn’t going to be a good soccer game because of the conditions, and it probably should have been closer. We were fortunate to capitalize on some of the chances we got.”

Marshwood (12-3-1), the only team to beat Scarborough this season, had two good chances to cut the lead in half, including a hard shot off the left post.

“I feel like the match was pretty even,” Marshwood Coach Luke Edgar said. “The score doesn’t show that, but the attacks were pretty similar.”

Chen scored her second with a hustle goal. Sparda got her second on a long direct kick.

Sydney Jackman scored for Marshwood in the 70th minute.