Fifth seed Philipp Kohlschreiber made a strong start at the inaugural Garanti Koza Sofia Open, beating Sergiy Stakhovsky 6-2, 6-2 on Tuesday in the first round.
Seventh seed Martin Klizan was first to reach the Garanti Koza Sofia Open quarter-finals. The Slovakian advanced with a 6-3, 2-6, 7-6(4) win over Lukas Rosol in two hours and four minutes on Wednesday. Klizan awaits the winner of fourth seed Andreas Seppi and Thiemo de Bakker.
Second seed Viktor Troicki began his quest for a second ATP World Tour title of the season on Thursday when he defeated qualifier Daniel Brands 6-4, 6-3 at the Garanti Koza Sofia Open. "He has a very aggressive game, which I usually like to play against and that’s maybe why I played really well," said Troicki.
Fourth seed Andreas Seppi reached his first ATP World Tour quarter-final since July 2015 (Hamburg) by sweeping past Thiemo de Bakker 6-2, 6-1 in 57 minutes. He'll now face seventh seed Martin Klizan. Sixth seed Gilles Muller struck 19 aces and lost six of his first service points in a 7-5, 7-6(4) win overRicardas Berankis in one hour and 49 minutes.