Peter Heller defeated Mikalai Haliak 6-2 6-4 in the Czech Republic F1 round of 16 on clay.
Heller P. took it in straight sets.
Peter Heller beat Mikalai Haliak 6-2 6-4. Umpiry, "Peter Heller vs Mikalai Haliak — Czech Republic F1 Round of 16", https://umpiry.com/match/2018-05-14/haliak-vs-heller-czech-republic-f1-r16?utm_source=cite (as of 14 May 2018).