Shuai Peng defeated Nadia Petrova 7-6 7-5 in the Doha round of 64 on hard. The upset overturned the form book — Nadia Petrova came in leading the head-to-head 4–3, defending last year's round of 16. That levelled the head-to-head at 4–4.
Peng S. took it in straight sets.
Peng S. and Petrova N. faced 5 of the same opponents in the last 12 months. Peng S. went 1–7 (13%) against them, Petrova N. 1–4 (20%). Results against comparable opponents are close (0 : 0 better-results split).
Hard: Petrova N. leads 4–3 · Clay: Peng S. leads 1–0
Shuai Peng beat Nadia Petrova 7-6 7-5. Umpiry, "Shuai Peng vs Nadia Petrova — Doha Round of 64", https://umpiry.com/match/2014-02-10/peng-vs-petrova-doha-r64?utm_source=cite (as of 10 February 2014).