Host Radnor picked up an 18-10 win against Notre Dame with the help of three goals each from Lindsay Britton and Shannon Quinn.
Haley Wentzel scored two goals, and Boyertown held on for an 8-7 win against Germantown Academy.
Ali Thaler scored her ninth goal in overtime from eight meters to give Baldwin a 16-15 win over Hill School. Baldwin had trailed, 11-6, at halftime.
Jules D'Orazio scored six goals and controlled five draws to lead Merion Mercy past Upper Dublin, 14-12.
Megan Parsons collected five goals in Villa Maria's 11-10 triumph vs. Unionville.
Alexa Maloney scored three goals for Methacton, which earned a 9-5 win against Shipley.
Harriton scored three goals in the first minute of the second half to start a 10-2 run and hand Great Valley its first loss, 15-13. Carleigh Foust scored five goals for the Rams. Both teams are 12-1.
Kristen Burnetta and Eliza Moran each tallied four goals for Agnes Irwin, which picked up a 12-10 win over Abington.
Nonleague. Emma Dillon scored six times to lead Jenkintown to a home win against Southern Lehigh, 18-12.
Kristen Daly had six goals and Lindsey Grabell scored five for Lower Merion in a 12-9 win against visiting West Chester Rustin.
Natalie Bulgier buried five goals in host Souderton's 18-6 victory against Upper Perkiomen.
Radnor's Tom Hemcher scored in overtime to give his team a home win at the Samson Festival against Downingtown West, 7-6. Chris Albany led Radnor with two goals.
In other Festival play:
Robert Raucci and Jonathan Vanderberg each scored twice to help Garnet Valley to a double-overtime win against St. Augustine, 6-5.
Joe Simpson picked up four goals in Cardinal O'Hara's 12-4 win against Shipley.
Vince Marra's three goals pushed Springfield (Delco) past Hatboro-Horsham, 6-4.
Peter Gayhardt scored four times and Tyler Chambers and Garrett Walling each had three goals for Episcopal Academy, which beat Lawrenceville, 14-9.
Colin Mottola had four goals, and Haverford High squeezed out a win against Archbishop Carroll, 13-12.
Chris Daly finished with four goals and three assists for Lower Merion in an 11-8 victory against Emmaus.
Kyle Lauletta netted a pair of goals for Downingtown East in an 8-6 win against Conestoga.
Hill School topped Germantown Academy, 9-6, on the back of J.D. Brachman's four goals.
Public. Southern picked up a 7-5 home win against Audenried behind Dale My's three goals.
Northeast topped visiting Washington, 18-2, with the help of Eric O'Brien's six goals.
Nonleague. Ty Bollard had four goals, and host Archbishop Ryan topped Sun Valley, 11-6.
John Mehok's five goals proved to be enough for Bishop Shanahan, which beat visiting Council Rock South, 12-3.
Bennett Zaba scored five of his team-leading 35 goals this season to push Holy Ghost Prep past visiting Central Bucks West, 15-6.
Tommy O'Connor had four goals in Malvern Prep's 14-8 home win against St. Joseph's Prep.
George School won at Oxford, 8-5, behind John Arth's five goals.
Jackson Kleintz dished out seven assists for Springside Chestnut Hill in a 17-6 win at Westtown.
Behind Will Manganiello's five goals, Penncrest beat visiting West Chester Henderson, 11-7.
Contact Nick Carroll at email@example.com. Follow on Twitter @NickJCarroll.