Old Lyme — The second-seeded Old Lyme High School girls’ tennis team began defense of its Class S state championship Saturday with a 7-0 victory over No. 18 Montville.

The Wildcats (17-2), who have won three straight Class S crowns, will next face No. 10 St. Paul in Tuesday’s quarterfinal round at Old Lyme.

Katherine Zhang, Emma Arelt and Rose Dimmock won singles matches for the Wildcats, who won No. 4 singles by forfeit. Doubles wins went to Aggie and Beatrice Hunt, Natalie Buckley and Stella Young and Allegra Schaedler and Ada LaConti.

Montville, which defeated Bolton in the qualifying round Friday, finished the season 8-11.

In other matches:

• No. 2 Stonington earned a doubles sweep in a 5-2 victory over No. 18 Hand in the first round of the Class M state tournament. Eastern Connecticut Conference doubles champions Katya Snegovskikh and Lauren Buckley won their match at No. 1 doubles, followed by Gwen McGugan and Angelina Williams at No. 2 and Bethany Schoenecker and Maya Bengston at No. 3. Grace Duggan and Marina Lewandowski won singles matches for the Bears (16-0), who will play in the quarterfinal round Tuesday against either No. 7 Joel Barlow or No. 10 Mercy.

• Sarah Hage, Michelle Liu and Ava Tinnerello won singles matches for No. 6 Waterford in a 5-2 victory over No. 22 RHAM in the first round of the Class M state tournament. The Lancers (13-3) moved on to the quarterfinals to face No. 3 Weston on Tuesday. The teams of Sophia Sit-Hazel Siu and Maple Siu-Bri Kilcomons picked up doubles wins for Waterford.

H.S. softball

• Top-seeded North Branford won its ninth straight Shoreline Conference tournament championship with a 10-1 victory over No. 2 Old Lyme in Clinton. Emma Bayor had a solo homer for Old Lyme in the fourth inning. North Branford scored five runs in the third inning to take a 9-0 lead. Old Lyme is 17-5.

H.S. boys’ lacrosse

• Tate Gordon had five goals and two assists for No. 13 Fitch in a 13-7 victory over No. 20 Wethersfield on Friday in the first round of the Class L state tournament. Boden Frost had two goals and four assists for Fitch (15-3) and Roman Rich two goals and one assist. Chase Beyus added 13 saves in goal. The Falcons advanced to a second-round matchup at No. 4 New Milford on Wednesday.

H.S. girls’ golf

• Mia Belcamino shot a 47 and Olivia Sabota had a 55 for Bacon Academy in a 227-241 victory over Woodstock Academy on Friday at Chanticlair Golf Course. Woodstock’s Reagan Scheck earned medalist honors with a 44. Bacon is 2-8 overall and in the ECC.

College women’s track

• Connecticut College’s Alexa Estes finished seventh in the 800 meters at the NCAA Division III Outdoor Track and Field Championships at Myrtle Beach, South Carolina. Estes finished in 2 minutes, 12.28 seconds, earning All-America honors. She qualified for the final on Friday, breaking her own school record in the preliminary round with a 2:10.64. Also competing for Conn was Grace McDonough, who finished 20th Thursday in the 1,500 in 4:42.18.

Learn to Row

• The Old Lyme Rowing Association will be hosting an open house from 10 a.m.-1 p.m. Saturday, June 1, at Hains Park in Old Lyme in honor of National Learn to Row Day. The free event, organized nationally by U.S. Rowing, is an opportunity to see firsthand what rowing is about as a low-impact sport for people of all ages and abilities. Participants can register online at http://www.oldlymerowing.org/register/