Kuan Yi Lee defeated Shintaro Imai 6-1 2-6 6-3 in the Japan F4 qualifying round on hard. The upset overturned the form book — Shintaro Imai came in leading the head-to-head 1–0. Kuan Yi Lee claimed a first win over Shintaro Imai in two meetings, levelling the head-to-head at 1–1.
Lee K. came through in three sets.
Kuan Yi Lee beat Shintaro Imai 6-1 2-6 6-3. Umpiry, "Kuan Yi Lee vs Shintaro Imai — Japan F4 Qualifying Round", https://umpiry.com/match/2018-03-26/imai-vs-lee-japan-f4-qf?utm_source=cite (as of 26 March 2018).