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Karen Khachanov defeated Learner Tien 7-5, 4-6, 6(6)-7(8), 6-1, 6-4 — US Open 2026 R16.
Karen Khachanov and Learner Tien: Karen Khachanov leads 1–0 across 1 recorded meeting.
The 14th seed and the betting market's 60 percent pick, Tien, is out of the US Open, his serve broken nine times and his three-match run here finished. Khachanov took 9 of 12 break points to Tien's 5 of 14, including breaks in games 1 and 3 of the fourth for 1-0 and 3-0; when the favorite broke for 2-1 in the fifth, the answer came in game 4 for 2-2. Tien out-hit him 55 winners to 48 and won 34 of 43 at net, and still held only 17 of 26 service games. Khachanov, 3 hours 49 minutes on court, books a quarterfinal with Blockx, the No. 32.