Yi Jing Zhao defeated Lu Guo 6-0 6-0 in the Manila 10K semi-final on hard. The upset overturned the form book — Lu Guo came in leading the head-to-head 1–0. Yi Jing Zhao claimed a first win over Lu Guo in two meetings, levelling the head-to-head at 1–1.
Zhao Y. took it in straight sets.
Yi Jing Zhao beat Lu Guo 6-0 6-0. Umpiry, "Yi Jing Zhao vs Lu Guo — Manila 10K Semi-final", https://umpiry.com/match/2011-11-14/guo-vs-zhao-manila-10k-sf?utm_source=cite (as of 14 November 2011).