Yong Il Yoon defeated Richard Fromberg 7-6 7-6 in the US Open qualifying round of 128 on hard. The upset overturned the form book — Richard Fromberg came in defending last year's round of 32.
Yoon Y. took it in straight sets.
Yong Il Yoon beat Richard Fromberg 7-6(5) 7-6(9). Umpiry, "Yong Il Yoon vs Richard Fromberg — US Open Qualifying Round of 128", https://umpiry.com/match/2001-08-27/fromberg-vs-yoon-us-open-q128?utm_source=cite (as of 27 August 2001).