“ Jan-Lennard Struff, Germany, def.
Ugo Humbert, France, 6-3, 6-1.
Kamil Majchrzak, Poland, def. Oscar Otte (8), Germany, 4-6, 6-2, 6-4.
Holger Rune (5), Denmark, def. Lorenzo Sonego, Italy, 6-7 (1), 6-4, 6-3.
Marc-Andrea Huesler, Switzerland, def.
Pablo Carreno Busta (2), Spain, 6-3, 3-6, 6-2.
Jannik Sinner (1), Italy, def. Nuno Borges, Portugal, 6-3, 6-4.
Aleksandar Vukic, Australia, def. Fernando Verdasco,
Spain, 1-6, 6-4, 6-3.
Simone Bolelli and Fabio Fognini (1), Italy, def.
Alexander Donski and Alexandar Lazarov, Bulgaria, 6-4, 6-3.
Florian Fallert and Oscar Otte, Germany, def. Ivan Sabanov
and Matej Sabanov, Serbia, 7-6 (4), 6-3.
Hugo Nys, Monaco, and Jan Zielinski (4), Poland, def.
Andrey Golubev and Aleksandr Nedovyesov, Kazakhstan, 6-1, 7-5.
David Vega Hernandez, Spain, and Rafael Matos (2), Brazil, def.
Yanaki Milev and Petr Nesterov, Bulgaria, 6-4, 6-4.
Jaworzno Poland - lib.utep.edu, ”