Ryota Tanuma advanced when Logan Smith retired 6-2 2-0 in the USA F8 qualifying round of 64.
Tanuma R. advanced when Smith L. retired.
Ryota Tanuma beat Logan Smith 6-2 2-0 after Logan Smith retired. Umpiry, "Ryota Tanuma vs Logan Smith — USA F8 Qualifying Round of 64", https://umpiry.com/match/2015-02-16/smith-vs-tanuma-usa-f8-q64?utm_source=cite (as of 16 February 2015).