Ya Hsuan Lee defeated Yuuki Tanaka 6-4 7-6 in the Tsukuba $25K round of 16 on hard. The upset overturned the form book — Yuuki Tanaka came in leading the head-to-head 1–0. Ya Hsuan Lee claimed a first win over Yuuki Tanaka in two meetings, levelling the head-to-head at 1–1.
Hsuan Lee Y. took it in straight sets.
Ya Hsuan Lee beat Yuuki Tanaka 6-4 7-6(11). Umpiry, "Ya Hsuan Lee vs Yuuki Tanaka — Tsukuba $25K Round of 16", https://umpiry.com/match/2015-08-24/lee-vs-tanaka-tsukuba-25k-r16?utm_source=cite (as of 24 August 2015).