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·Masters·HardChristopher O'Connell won after Casper Ruud retired (7-5, 1-2) — Cincinnati Open 2026 R64.
Christopher O'Connell and Casper Ruud: Christopher O'Connell leads 1–0 across 1 recorded meeting.
A new name sits atop Christopher O'Connell's list of biggest wins, displacing Grigor Dimitrov, beaten at ATP No. 16 in Dubai last February. Against Casper Ruud, a 75 percent market favorite, O'Connell took both break points he earned and landed 13 aces to the No. 11 seed's one, winning 41 of the 81 points played. Ruud managed one break from his two looks and eight winners to O'Connell's 20. The 133rd-ranked advancer moves on to the Round of 32.