Auger-Aliassime Plans Medical Tests After Dizziness in US Open Loss

What happened

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Felix Auger-Aliassime said he will undergo medical tests after dizziness and problems with his vision affected him during a second-round defeat at the 2026 US Open. The Canadian lost 6-7(5), 6-3, 6-2, 6-2 to Karen Khachanov on Thursday inside Louis Armstrong Stadium, ending his run at a tournament where he had previously reached two semifinals.

The official US Open website reported that Auger-Aliassime began feeling dizzy and seeing spots after roughly a set and a half. He said the symptoms were unlike the cramps or ordinary late-match fatigue he had experienced before, and that there had been no warning signs in the preceding days or on the morning of the match.

How the match changed

Auger-Aliassime won a 62-minute opening set in a tiebreak but did not lead again. USOpen.org recorded 99 total errors from the Canadian, including 47 unforced and 52 forced errors, compared with 60 for Khachanov. The errors accumulated as Khachanov established early leads in each of the next three sets.

The Canadian considered stopping after losing the third set, according to the tournament's report, but hoped a break, hydration and supplements might help. His condition did not improve. Once he fell behind 3-0 and then 4-0 in the fourth set, he decided to complete the match rather than retire.

Why it matters

The result sends Khachanov into the third round and removes one of the leading men's seeds from the draw. Khachanov, a US Open semifinalist in 2022, now leads the pair's head-to-head series 3-2. He described survival as the most satisfying aspect of the victory while acknowledging that he did not know whether his opponent was injured.

For Auger-Aliassime, the immediate question extends beyond the result. He said he could not move normally and therefore could not assess the defeat purely in tennis terms. The 26-year-old plans to consult doctors as well as members of his fitness, physiotherapy and nutrition team to establish what caused the episode.

What to watch

Auger-Aliassime said he expects to digest the disappointment, return home and resume training after those discussions. His next stated competitive priority is Canada's Davis Cup qualifier against France in Quebec City on September 18-19. The tie carries a place in November's Davis Cup Finals in Bologna, but his availability will depend on what the medical evaluation finds.

Source note

This report is based on the US Open's official match coverage and its post-match account of Auger-Aliassime's comments. The cause of his symptoms had not been established when that report was published, so no diagnosis has been attributed.