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The publicity generated by the book has forced senior Democrats to field questions on why they did not do more to respond to Americans' concerns about Biden's health as he campaigned for re-election.

And I know that even if something like that were to take place, we’re going to do everything by the book, and we’re going to maximize that to the best of our ability.

"They've come around to really playing by the book, to be a good steward of processes... working with regulators to make sure what they deploy is safe."

"Jannik is a very resilient young man, and in his own mind he knows he's done absolutely nothing wrong and the process has been absolutely by the book. So I think he's very comfortable in himself," Singer told BBC Sport.

But it cannot duck the reality that, for as much as everyone involved might insist this case has been handled by the book, it has left some people feeling very uneasy.