Shuichi Sekiguchi defeated Karunuday Singh 6-0 6-2 in the Thailand F5 qualifying round on hard. The upset overturned the form book — Karunuday Singh came in leading the head-to-head 1–0, but Shuichi Sekiguchi had been the form player, winning 8 of their last 10 on hard. Shuichi Sekiguchi claimed a first win over Karunuday Singh in two meetings, levelling the head-to-head at 1–1.
Sekiguchi S. took it in straight sets.
Shuichi Sekiguchi beat Karunuday Singh 6-0 6-2. Umpiry, "Shuichi Sekiguchi vs Karunuday Singh — Thailand F5 Qualifying Round", https://umpiry.com/match/2015-06-22/sekiguchi-vs-singh-thailand-f5-qf?utm_source=cite (as of 22 June 2015).