Thiem, Wawrinka reach St. Petersburg semifinalsDominic Thiem of Austria returns the ball to Daniil Medvedev of Russia during the St. Petersburg Open ATP tennis tournament quarter final match in St.Petersburg, Russia, Friday, Sept. 21, 2018. (AP Photo/Dmitry Lovetsky)
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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