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Karen Khachanov won after Alexander Blockx retired (6-2, 7-5, 3-2) — US Open 2026 Quarterfinal.
Karen Khachanov and Alexander Blockx: Karen Khachanov leads 1–0 across 1 recorded meeting.
The 2023 Australian Open semifinalist advanced from the US Open quarterfinals on a retirement, Blockx stopping after 1h 38m at 6-2, 7-5, 3-2 down. Khachanov held all 12 of his service games and took four of six break points; the 28th seed converted neither of his two. The last-four berth is his first at Flushing Meadows.