ST. PETERSBURG, Russia (AP) Top-seeded Dominic Thiem and fit-again Stan Wawrinka won their quarterfinal matches at the St. Petersburg Open on Friday.
Austrian player Thiem came through a tough encounter against Daniil Medvedev of Russia, firing 10 aces on his way to a 6-2, 3-6, 7-6 (2) victory.
His reward is a semifinal with Roberto Bautista Agut of Spain, who won 7-6 (0), 6-3 against Marco Cecchinato.
Experienced Swiss Wawrinka, aiming for his first title since sustaining a severe knee injury last year, next plays Martin Klizan of Slovakia after beating last year's St. Petersburg champion Damir Dzumhur 6-3, 6-4.
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