Sa Chen defeated Kento Takeuchi 6-3 6-4 in the Korean Rep F4 round of 16 on hard. The upset overturned the form book — Kento Takeuchi came in leading the head-to-head 1–0. Sa Chen claimed a first win over Kento Takeuchi in two meetings, levelling the head-to-head at 1–1.
Chen S. took it in straight sets.
Hard: Chen S. leads 1–0 · Carpet: Takeuchi K. leads 1–0
Sa Chen beat Kento Takeuchi 6-3 6-4. Umpiry, "Sa Chen vs Kento Takeuchi — Korean Rep F4 Round of 16", https://umpiry.com/match/2009-04-27/chen-vs-takeuchi-korean-rep-f4-r16?utm_source=cite (as of 27 April 2009).