In racing, the bet becomes void if the horse is a non-runner, and the stake is refunded.
Bets on non-runner horses in ante-post events will be considered lost. If it’s part of an accumulator bet, only that selection is excluded, and all the elements of the rest of the bet remain valid.
In tennis, if a player retires after completing just 1 set, bets on that set will remain valid, while bets placed on other sets will be void.
If they retire before completing the first set, all bets are void.
For more details, check our Betting rules.