Formula1.com lists Yuki Tsunoda as Red Bull Racing reserve driver
Yuki Tsunoda — a Racing Bulls race driver — is listed on the official Formula1.com Red Bull Racing team page as a reserve driver, indicating a formal backup role recorded on the sport's official site.
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Source: Official Formula1.com Red Bull Racing team page.
Entry: 'Reserve Driver: Yuki Tsunoda' appears in the team's driver listing.
No additional contractual detail or duration is provided on the page.
Reserve-driver listings can be used for short-notice seat coverage in case of illness, injury or other absence.
The listing does not indicate any immediate driver change for Racing Bulls' race lineup.
No announcement in this source of Tsunoda stepping into another team's race seat.