Christopher Morin Kougoucheff advanced when Alexander Yarkov retired 6-0 in the USA F8 qualifying round of 64.
Morin Kougoucheff C. advanced when Yarkov A. retired.
Christopher Morin Kougoucheff beat Alexander Yarkov 6-0 after Alexander Yarkov retired. Umpiry, "Christopher Morin Kougoucheff vs Alexander Yarkov — USA F8 Qualifying Round of 64", https://umpiry.com/match/2015-02-16/kougoucheff-vs-yarkov-usa-f8-q64?utm_source=cite (as of 16 February 2015).