LEWISTON — The girls of Falmouth have long been the reigning state champions.

Now they’re the raining champs as well.

Falmouth ran its winning streak to 140 consecutive matches Thursday by beating Scarborough 4-1 in a Class A South girls’ tennis final that started on the Wallach Tennis Complex before a persistent sprinkle forced play indoors at Bates College.

Top-seeded Falmouth (15-0) will attempt to win a ninth straight state title Saturday at Lewiston High against North champion Lewiston (15-0). Scarborough, with an all-senior lineup, finished 14-1.

In other South regional finals played outside earlier Thursday, No. 2 Cape Elizabeth swept No. 8 York 5-0 to reach the Class B state final for the first time since 2007 and No. 1 St. Dominic beat No. 6 Waynflete, 4-1.

“I was pretty nervous about Scarborough,” said first-year Falmouth coach Bill Goodspeed, an assistant to Sandra Stone last season. “So I’m both relieved and very happy that we pulled it out.”

Caroline Ray and Kate Kelley won in straight sets outdoors at second and third singles before the rain delay. Amanda Watson and Mary Hyland clinched the match with a 6-3, 6-2 victory completed indoors on a rug-like surface.

“We do get nervous,” Watson said of Falmouth’s dominance. “But we also know it’s going to be a fun match.”

“We go through periods when either Amanda or I are struggling with something,” Hyland said. “So in matches, we try to focus on our own games and not to play to the same level as our opponents.”

Anna Driscoll and Brielle Hardy of Scarborough averted the shutout with a 7-5, 6-4 victory at No. 2 doubles. Julia Brogan of Falmouth, the singles state champ, finished things off with a straight-set victory over Megan Nathanson.

The other state finals Saturday feature Cape Elizabeth (13-2) against Camden Hills (13-2) in Class B and St. Dominic against Mattanawcook Academy (13-2) in Class C. Although the Class B North title match was played Tuesday, Maddie Bowe of Cape Elizabeth had no idea whether Camden Hills or Waterville won.

“We had a heartbreaking loss last year,” said Bowe, referring to a 3-2 quarterfinal upset by Yarmouth. “So we didn’t even look ahead because we didn’t want to think about who we would play next.”

Bowe and her doubles partner, Sarah O’Connor, were last on the court for that upset loss to Yarmouth, who beat the Capers again this season by the same score, with Bowe and O’Connor losing a three-set match that featured three tiebreakers.

That made Thursday’s 6-2, 6-2 victory at No. 1 doubles all the more satisfying.

“We especially wanted revenge,” O’Connor said. “We started out shaky but then we settled in.”

Taylor Hansen and Amelie Jarquin won at No. 2 doubles, and Liv Clifford, Katie Gilman and Erin Whitcomb won in straight sets in singles for Cape.

“We’re full of athletes and competitors,” said Cape Elizabeth Coach Sarah Boeckel.

In Class C, Waynflete (8-7) won at No. 2 doubles behind Almu Conales and Lily Fanburg, 6-3, 7-5. St. Dominic swept the rest, including singles victories from singles semifinalist Bethany Hammond, Rachel Kurtz and Clare Kramer.