Seniors Haley Mathews, Julia Chang and Sarah Tiemann played their final girls' high school tennis matches on Tuesday.
Juniors Julia Marks and Sara Choy still have another year.
In fact, the top-seeded Choy still has Wednesday.
Choy, the two-time Central Coast Section defending champion from Sacred Heart Prep, opened the tournament with a 6-0, 6-0 victory over Pacific Grove's Savannah McDowell at Bay Club Courtside.
She later beat Cupertino's Kate Duong, 6-0, 6-2, to improve to 78-0 against high school competition.
Choy meets No. 4 seed Nadia Ghaffari of Los Altos in Wednesday's semifinal.
Duong advanced by beating Pinewood's Mathews, 6-2, 6-1. Matthews lost to Choy in the West Bay Athletic League championship match.
"It was a cool experience," Mathews said. "I tried to make it in doubles last year, so it was cool to make it to CCS among the best players."
Mathews was the only player in the WBAL to take a game from Choy and took two games from her during a regular season match.
She's not sure she wants to make the commitment to play at the varsity level in college next year, though she'll certainly consider competing at the club level.
"I've played a lot of tennis and it might be time to try something else," she said. "I've definitely enjoyed the experience for my whole life."
Marks, who lost to second-seeded Ashley Yeah of Los Gatos, 6-2, 6-2, will return to Menlo-Atherton next season to form one of the top singles duos in the CCS at the top of the ladder.
Chang and Tiemann, who play doubles together outside of school, dropped a 6-2, 6-0 decision to the top-seeded duo from Saratoga, Stephanie Ren and Monica Stratakos.
"I've never played in the CCS individual tournament so it was a cool opportunity, especially as a senior," Tiemann said. "It's a nice way to walk off."
Chang was part of a doubles team that reached the second round last year and was thrilled to return.
"It's amazing to make this far," she said. "I didn't know how we were going to do in the league tournament."
Chang and Tiemann have been partners for about two years and are making plans to participate in future USTA events.
Both the semifinals and finals will be held Wednesday at Bay Club Courtside. The semis are scheduled to begin at noon.
Stanford grad Bradley Klahn returned to the court for the first time since February of 2015 after recovering from surgery to repair a herniated disc.
Klahn qualified for the main draw of the JSM Challenger at the Atkins Tennis Center in Illinois and then won his first-round match Tuesday, beating Australia's Sam Groth, who retired after dropping the first set, 7-6 (5).
Klahn plays American Tennys Sandgren in the second round.
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San Diego's Timothy Sah and New York's Sam Turchetta signed letters for Stanford, as did Michaela Gordon, ranked fifth in the nation, of Los Altos Hills.