Novak Djokovic advanced when Stan Wawrinka retired 6-4 6-1 3-1 in the US Open round of 16. Novak Djokovic extended the head-to-head to 12–2.
Djokovic N. advanced when Wawrinka S. retired.
Djokovic N. and Wawrinka S. faced 15 of the same opponents in the last 12 months. Djokovic N. went 23–8 (74%) against them, Wawrinka S. 9–8 (53%). Djokovic N. came out better against 6 of 14 comparable opponents, Wawrinka S. against 2.
Hard: Djokovic N. leads 7–1 · Clay: Djokovic N. leads 5–1
Novak Djokovic beat Stan Wawrinka 6-4 6-1 3-1 after Stan Wawrinka retired. Umpiry, "Novak Djokovic vs Stan Wawrinka — US Open Round of 16", https://umpiry.com/match/2012-08-27/djokovic-vs-wawrinka-us-open-r16?utm_source=cite (as of 27 August 2012).