Isabella Holland defeated Chiaki Okadaue 6-2 6-3 in the Darwin 25K round of 16 on hard. The upset overturned the form book — Chiaki Okadaue came in leading the head-to-head 2–1. That levelled the head-to-head at 2–2.
Holland I. took it in straight sets.
Isabella Holland beat Chiaki Okadaue 6-2 6-3. Umpiry, "Isabella Holland vs Chiaki Okadaue — Darwin 25K Round of 16", https://umpiry.com/match/2011-09-19/holland-vs-okadaue-darwin-25k-r16?utm_source=cite (as of 19 September 2011).