Tatsuma Ito defeated Chase Buchanan 6-1 6-2 in the US Open qualifying round of 64 on hard. The upset overturned the form book — Chase Buchanan came in defending last year's round of 128, but Tatsuma Ito had been the form player, winning 3 of their last 8 on hard.
Ito T. took it in straight sets.
Tatsuma Ito beat Chase Buchanan 6-1 6-2. Umpiry, "Tatsuma Ito vs Chase Buchanan — US Open Qualifying Round of 64", https://umpiry.com/match/2010-08-27/buchanan-vs-ito-us-open-q64?utm_source=cite (as of 27 August 2010).