Juan Martin del Potro defeated Steve Johnson 7-6 6-3 6-2 in the US Open round of 64 on hard. The upset overturned the form book — Steve Johnson came in defending last year's round of 128.
del Potro J. took it in straight sets.
del Potro J. and Johnson S. faced 4 of the same opponents in the last 12 months. del Potro J. went 2–2 (50%) against them, Johnson S. 2–4 (33%). Results against comparable opponents are close (1 : 0 better-results split).
Only 4 common opponents — small sample, treat as indicative.
Juan Martin del Potro beat Steve Johnson 7-6 6-3 6-2. Umpiry, "Juan Martin del Potro vs Steve Johnson — US Open Round of 64", https://umpiry.com/match/2016-08-29/johnson-vs-potro-us-open-r64?utm_source=cite (as of 29 August 2016).