Four-time Grand Slam champion Naomi Osaka kicked off her 2026 season with a win for Japan in the United Cup. Britain's Emma Raducanu withdrew from their singles match due to a fitness issue, allowing Osaka to defeat substitute Katie Swan in straight sets. Despite Osaka's victory, Great Britain clinched the tie 2-1 with a decisive mixed doubles win.
In the United Cup group stage, Japan faced Great Britain in a key tie. The first singles match saw Naomi Osaka scheduled against Emma Raducanu, but Raducanu pulled out due to a fitness issue. Osaka then overpowered Britain's substitute, world No. 276 Katie Swan, with a 7-6 (7/4), 6-1 victory while Raducanu watched from the sidelines.
Osaka's win marked a strong start to her 2026 season, but the overall match score hinged on the mixed doubles. Great Britain secured that rubber to take the tie 2-1. The United Cup, a team event featuring mixed national squads, serves as a prominent season opener. Osaka demonstrated her dominance by edging the tiebreak and cruising the second set.
No direct quotes from Osaka were reported post-match. Raducanu's withdrawal impacted her team, yet Great Britain rallied in other rubbers. Japan thus fell short in its debut encounter of the tournament.