Alexander Erler @ ATP Sofia

Adrian Mannarino Marc-Andrea Huesler Martin Klizan Viktor Troicki Daniel Brands Roberto Bautista-Agut Radu Albot Robin Haase Fernando Verdasco Filip Krajinovic Grigor Dimitrov Cem Ilkel Maximilian Marterer Ilya Ivashka Richard Gasquet Billy Harris Stan Wawrinka Matteo Berrettini David Goffin Lukas Lacko James Duckworth Mikhail Youzhny Steve Darcis Sebastian Ofner Taro Daniel Jurij Rodionov Stefano Travaglia Gianluca Mager Lorenzo Sonego Mikael Ymer Blaz Kavcic Roberto Carballes Baena Jerzy Janowicz Sergiy Stakhovsky Albert Ramos-Vinolas Mikhail Kukushkin Alexey Vatutin Daniel Elahi Galan Karen Khachanov Marco Cecchinato Frederico Ferreira Silva Jaume Munar Andrey Kuznetsov Marin Cilic Philipp Kohlschreiber Andrea Arnaboldi Andrej Martin Alexander Erler Tim Van Rijthoven Teymuraz Gabashvili