World number three Stan Wawrinka beat Roberto Bautista Agut 7-6(8) 6-2 on Saturday and will play Alexander Zverev in the St. Petersburg Open final.

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The Swiss top seed, playing his first tournament since beating Novak Djokovic to win the US Open title, wore down the Spanish fourth seed Bautista Agut after a tight first set.

German Zverev, the fifth seed, upset third seed Tomas Berdych of the Czech Republic 6-4 6-4.

The 19-year-old, who has Russian roots, will be hoping it is third time lucky in his third ATP final after losing the previous two.