Wimbledon champion Garbine Muguruza has been bundled out of the Stanford Classic by Madison Keys.
No.3 seed Keys won 6-3 6-2, ending her Spanish opponent's nine-match winning streak in the process on Saturday.
Muguruza had impressed en route to the semi-finals of the California tournament as she sought to follow up her impressive Grand Slam success last month.
However, the top seed was punished for an off-colour performance by America's Keys, who wrapped up victory in 58 minutes.
Keys will play the Pat Cash-trained Coco Vandeweghe in Sunday's final after the American's straight sets victory over compatriot Catherine Bellis.
In the first career meeting between the two, No.6 seed Vandeweghe beat her 18-year-old opponent 6-3 6-1 to maintain an impressive run which has seen her win every set in this year's Stanford tournament.
In the Citi Open at Washington, Ekaterina Makarova will face Julia Goerges in Sunday's final at Rock Creek Park Tennis Centre.
Russia's Makarova beat France's Oceane Dodin 3-6 6-3 6-4, while Goerges came from behind to win the all-German semi-final against Andrea Petkovic 5-7 6-4 7-5.
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