2018 Silicon Valley Classic – Singles

Madison Keys was the defending champion, but withdrew due to a wrist injury.

Mihaela Buzărnescu won her first WTA Tour singles title, defeating Maria Sakkari in the final, 6–1, 6–0.

Seeds
The top four seeds received a bye into the second round. • #🇪🇸 Garbiñe Muguruza (withdrew)

• #🇺🇸 Madison Keys (withdrew)

• #🇺🇸 Venus Williams (quarterfinals)

• #🇧🇪 Elise Mertens (semifinals)

• #🇷🇴 Mihaela Buzărnescu (champion)

• #🇺🇸 Serena Williams (first round)

• #🇨🇳 Zhang Shuai (first round)

• #🇭🇺 Tímea Babos (second round)

Note: Aryna Sabalenka, who would have been placed in the entry list on the initial entry cutoff date of June 18, 2018 and seeded 7th, entered late and played the qualifying tournament. But she was eliminated in qualifying matches.

Seeds
• #🇧🇾 Aryna Sabalenka (first round)

• #🇷🇺 Anna Blinkova (qualifying competition, lucky loser)

• #🇺🇸 Nicole Gibbs (first round)

• #🇵🇱 Magdalena Fręch (qualifying competition, lucky loser)

• # Verónica Cepede Royg (qualified)

• #🇺🇸 Irina Falconi (qualifying competition)

• #🇪🇸 Georgina García Pérez (qualified)

• #🇺🇸 Amanda Anisimova (qualified)

Qualifiers
• # 🇪🇸 Georgina García Pérez

• # 🇺🇸 Amanda Anisimova

• # 🇺🇸 Danielle Lao

• # Verónica Cepede Royg

Lucky losers
• # 🇷🇺 Anna Blinkova

• # 🇵🇱 Magdalena Fręch