Norton softball pitcher Kelly Nelson has dominated teams all season from inside the circle. Saturday was no different as Nelson pitched her second perfect game of the year, leading the host Lancers past Pembroke, 6-0, in a Division 2 South sectional first-round game.

“She’s getting better and better,’’ Norton coach Wade Lizotte said of his sophomore pitcher. “Her composure on the mound is just incredible. She put the ball where she needed to put the ball.’’

Nelson got two batters to ground out to start the game before finding a groove and striking out the next seven.

“I was feeling a little shaky [in the first inning]. I wasn’t quite getting my spins down,’’ Nelson said. “But by the second I think I relaxed my nerves and got going.’’

Nelson finished with 14 strikeouts. She kept runners off the bases long enough for the Lancers’ offense to heat up.

Through four innings, Norton (20-1) had six hits but left runners in scoring positions. But in the fifth inning, the Lancers put up four runs.

Alexandra Frontino led off with a single down the third base line and then stole second. Taylor Cibotti then reached on a well-executed bunt to put runners on first and third. After Pembroke pitcher Taryn Cahill walked the next batter to load the bases, Frontino was awarded home on a balk by Cahill.

“I’m really glad [the game wasn’t decided by a balk],’’ Lizotte said. “The rules are the rules, and I apologized to the pitcher and the coach but the rules are the rules, and I think the umpire had the right call there.’’

The bases were still loaded with no outs with Nelson stepping to the plate. Before Nelson could get to hit, Cibotti was able to score on a wild pitch, giving Norton a 2-0 lead.

Nelson then hit a two-run single to put the Lancers up, 4-0.

“We had a good game plan going into today and the girls executed it very well,’’ Lizotte said. “I just knew it was a matter of time before the runs started coming.’’

Norton added to its lead in the sixth. Frontino smacked a double to center and was advanced with a sacrifice bunt by Cibotti. Then, with two outs, Stephanie Nosky hit a line drive down the third base line to bring Frontino home. The throw to first went past the first baseman and Nosky was able to reach second. She was then brought home on a single by Carli Arcaro, putting the Lancers up, 6-0.

Nelson struck out the first batter of the seventh before getting the next two to pop out and secure the perfect game.

The Lancers will face Archbishop Williams Monday.

Division 1 North

Medford 3, Boston Latin 2 — Freshman center fielder Brenna Forbes’s two-run triple helped boost the fourth-seeded Mustangs, while senior Ashely Eisnor struck out 17.

Lexington 3, Billerica 1 — Senior Maggie Oram struck out nine to pick up her 16th win of the season for the Minutemen (17-4).

Revere 8, Westford 5 — Senior Ally Hinojosa went 2 for 4 with a double and a three-run homer, finishing with five RBIs.

Division 1 South

King Philip 5, Norwood 0 — Senior Kali Magane allowed just three hits in the shutout, and junior Jenn Hutnyan hit a home run for the host Warriors (20-4).

Division 2 South

Hanover 1, Seekonk 0 — The lone run came home on a sacrifice fly to center by junior Abby Harrison, scoring sophomore Lauren Gelly in the bottom of the second. Senior Callie MacDonald threw a three-hitter, striking out nine.

Division 3 South

East Bridgewater 3, Millis 2 — Senior Jenna Talabach hit a walkoff single in the ninth. Junior Jackie Gavin got the win and added two doubles, a single, and two runs.

Baseball

Division 3 North

East Boston 4, Amesbury 3 — Freshman Josh Rivera pitched three scoreless innings in relief as the Jets prevailed.

Boys’ lacrosse

Division 1 North

Reading 12, North Andover 3 — Dan Cozzi had five goals and Colin Doherty and Jack Geiger added three each.

Division 2 North

Beverly 14, Burlington 9 — Nick DiLuiso scored six goals for the host Panthers.

Girls’ tennis

Division 1 South

Wellesley 4, Brookline 1 — Senior Ashley Avery won first singles for the Raiders.

Sharon 4, Franklin 1 — The Eagles got singles wins from Emily Wen (6-0, 6-0) and Nupar Shulka (6-0, 6-0), and swept the doubles behind Pooja Puttigampala and Michal Kondratiev (6-1, 6-2) and Katie Merport and Rithica Neti (6-0, 6-0).

More highlights on bostonglobe.com/schools.