Olympics and all other Championships
In Outright markets all bets shall stand irrespective of whether the athlete competes or not (all-in run or not). If a swimmer withdraws before they have taken part in the event, the bet will be a loser.
Both swimmers must start an event, or all bets will be void.
Settlement of bets
All bets will be settled on the medal ceremony regardless of any subsequent disqualification. If there is no podium ceremony, settlement of bets will be based on the result declared by the official governing body FINA immediately after the event, irrespective of any subsequent enquiry.
Nationality of Winner
This is determined by the country the winner competes for (not the country they were born in if there is a difference).
If there is a presentation ceremony, bets will be settled in accordance with the official result of the relevant governing body at the time of the ceremony.
If there is no presentation ceremony, bets will be settled in accordance with the official result of the relevant governing body immediately after the event.
The above applies regardless of any subsequent disqualification or amendment to the result (except if an amendment is announced within 24 hours of the initial settlement of the relevant market in order to correct an error in reporting the result).
The Exchange General Rules and Market Information will apply in respect of any category of bets or markets not referred to in the Specific Sports Rules. If there is any inconsistency between the Specific Sports Rules and the Exchange General Rules, the Specific Sports Rules shall prevail. If there is any inconsistency between the Market Information and either the Exchange General Rules or the Specific Sports Rules, the Market Information shall prevail.
See here for the Exchange General Rules.