The Northern California Open is a defunct WTA Tour affiliated women's outdoor hard court.
It was founded in 1978 as the Avon Futures of Northern California its sponsored name, and was played annually with breaks until 1988.
In 1987 now in Aptos, California the event was branded as the North Face Open (its sponsored name).
From 1987 to 1988 its final two editions it was played in Aptos, California in the United States
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