Sakkari upsets Venus Williams to reach Silicon Valley semis

Venus Williams, of the United States, serves to Maria Sakkari, of Greece, during the Mubadala Silicon Valley Classic tennis tournament in San Jose, Calif., Friday, Aug. 3, 2018. (AP Photo/Jeff Chiu)
Maria Sakkari, of Greece, returns to Venus Williams, of the United States, during the Mubadala Silicon Valley Classic tennis tournament in San Jose, Calif., Friday, Aug. 3, 2018. (AP Photo/Jeff Chiu)
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. Sakkari won 6-4, 7-6 (2). (AP Photo/Jeff Chiu)
Venus Williams, of the United States, returns to Maria Sakkari, of Greece, during the Mubadala Silicon Valley Classic tennis tournament in San Jose, Calif., Friday, Aug. 3, 2018. (AP Photo/Jeff Chiu)
Maria Sakkari, of Greece, reacts 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. (AP Photo/Jeff Chiu)
Venus Williams, of the United States, returns to Maria Sakkari, of Greece, during the Mubadala Silicon Valley Classic tennis tournament in San Jose, Calif., Friday, Aug. 3, 2018. (AP Photo/Jeff Chiu)

SAN JOSE, Calif. — Maria Sakkari of Greece upset third-seeded Venus Williams 6-4, 7-6 (2) on Friday night in the quarterfinals of the Mubadala Silicon Valley Classic.

Sakkari came back from 0-3 in the first set and 3-5 in the second set. She advanced to face American Danielle Collins — with the winner reaching her first WTA final.

Collins, a two-time NCAA champion for Virginia, advanced after former world No. 1 Victoria Azarenka of Belarus retired midway through the second set due to injury.

Azarenka led 4-2 in the first set before needing a tiebreaker to win the 72-minutes set 7-6 (4). She grabbed her right leg in the opening game of the second set, lost the first three games and was evaluated by a trainer and doctor before retiring prior to the fourth game.

Fifth-seeded Mihaela Buzarnescu of Romania secured the first semifinal spot by beating Australia's Ajla Tomljanovic 6-1, 7-5. The Romanian will face No. 4 seed Elise Mertens.

Mertens, a Belgian, saved two set points in the first set, forced a tiebreak and won four straight games in the second set for a 7-6 (4), 6-3 victory over Johanna Konta. It's Mertens' fifth WTA semifinal of the year.

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