Ramkumar Ramanathan defeated Paul Henri Mathieu 6-4 6-4 in the US Open qualifying round of 128 on hard. The upset overturned the form book — Paul Henri Mathieu came in defending last year's round of 64.
Ramanathan R. took it in straight sets.
Ramkumar Ramanathan beat Paul Henri Mathieu 6-4 6-4. Umpiry, "Ramkumar Ramanathan vs Paul Henri Mathieu — US Open Qualifying Round of 128", https://umpiry.com/match/2017-08-23/mathieu-vs-ramanathan-us-open-q128?utm_source=cite (as of 23 August 2017).