Ze Zhang defeated Denis Istomin 3-6 7-5 2-6 6-1 6-4 in the CHN vs UZB round robin on clay. The upset overturned the form book — Denis Istomin came in leading the head-to-head 2–1. That levelled the head-to-head at 2–2.
Zhang Z. came through in five sets.
Clay: level 1–1 · Hard: level 1–1
Ze Zhang beat Denis Istomin 3-6 7-5 2-6 6-1 6-4. Umpiry, "Ze Zhang vs Denis Istomin — CHN vs UZB Round Robin", https://umpiry.com/match/2016-07-15/istomin-vs-zhang-chn-vs-uzb-rr?utm_source=cite (as of 15 July 2016).