Sakkari was down a set and a double break against Danielle Collins before charging back to win 3-6, 7-5, 6-2.
Serena slayer Johanna Konta was sent packing from the Silicon Valley Classic on Friday when she suffered a 7-6 (4) 6-3 quarter-final loss to fourth seed Elise Mertens.
Maria Sakkari, of Greece, celebrates after winning a point against Venus Williams, of the United States, during the Mubadala Silicon Valley Classic tennis tournament in San Jose, Calif., Friday, Aug. 3, 2018. She advanced to face American Danielle Collins - with the victor reaching her first WTA final.
She won four straight games in the second set to put pressure on Collins, and ultimately evened the match with a forehand victor. It's Mertens' fifth WTA semifinal of the year.
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In a rematch of Hobart International final in January, Buzarnescu fought back from a set down to get revenge and set up the biggest match of her career.
Collins won her 20th match on home soil this year to reach her second WTA semifinal of the year, following her final four run in Miami.
The first set saw the two players exchange breaks before the Belgian took the tie-break and Konta lost her first two service games in the second set as Mertens wrapped up victory in an hour and 35 minutes.