Marc Sieber defeated Jannis Kahlke 6-1 6-2 in the Turkey F23 round of 16 on clay.
Sieber M. took it in straight sets.
Marc Sieber beat Jannis Kahlke 6-1 6-2. Umpiry, "Marc Sieber vs Jannis Kahlke — Turkey F23 Round of 16", https://umpiry.com/match/2017-06-12/kahlke-vs-sieber-turkey-f23-r16?utm_source=cite (as of 12 June 2017).