Yukun Zhang defeated Hanyu Guo 7-5 6-1 in the Anning $10K round of 16 on clay.
Zhang Y. took it in straight sets.
Yukun Zhang beat Hanyu Guo 7-5 6-1. Umpiry, "Yukun Zhang vs Hanyu Guo — Anning $10K Round of 16", https://umpiry.com/match/2015-06-08/guo-vs-zhang-anning-10k-r16?utm_source=cite (as of 8 June 2015).