Madison Keys is back to defend the title she won in 2017, with the tournament being held in San Jose for the first time after previously being held in Stanford. However, the American is up against a stellar field as the run-up to the US Open begins.
Wang Qiang caused an upset after beating Venus Williams in straight sets, despite it being slightly predictable after the draw was made. This first-round win at the French Open was the Chinese's biggest win of her career.
Venus Williams claimed a comfortable victory over world number 27 Carla Suarez Navarro in the quarterfinals of the BNP Paribas Open as she set up a blockbuster semifinal encounter against Daria Kasatkina.