Three seeds exited the Pan Pacific Open on Thursday, as Misaki Doi continued her impressive form in her home country.
Kiki Bertens awaits at the Pan Pacific Open for Anastasia Pavlyuchenkova, who was a round-one winner in Osaka.
Camila Giorgi was in control of the deciding set, but ultimately fell to a late surge from first-time WTA Tour winner Magda Linette.
Camila Giorgi saved four match points to edge Wang Qiang in the Bronx Open semi-finals.
Wang Qiang recovered from a first-set bagel to prevail 0-6 6-1 6-4 against Russian lucky loser Anna Blinkova on Thursday.
Barbora Strycova lost in the second round of the Bronx Open as she struggles to build on her Wimbledon run.
Camila Giorgi had no answers in Washington, as Jessica Pegula won the Citi Open to the delight of the home crowd.
Camila Giorgi moved through to her seventh WTA final, while Caty McNally teamed up with Coco Gauff to win the double's title.
Camila Giorgi cruised into the last four at the Citi Open, where no seeds made the semi-finals.
After eliminating Wimbledon sensation Coco Gauff in the round of 32, Zarina Diyas upstaged fifth seed Lesia Tsurenko 6-4 6-4.