Martin Borisiouk advanced when Bekkhan Atlangeriev retired 4-1 in the M15 Kazan 3 quarter-final.
Borisiouk M. advanced when Atlangeriev B. retired.
Martin Borisiouk beat Bekkhan Atlangeriev 4-1 after Bekkhan Atlangeriev retired. Umpiry, "Martin Borisiouk vs Bekkhan Atlangeriev — M15 Kazan 3 Quarter-final", https://umpiry.com/match/2021-11-26/atlangeriev-vs-borisiouk-m15-kazan-3-qf?utm_source=cite (as of 26 November 2021).