If the match you bet on has not been completed, for any reason, within the same day of its original starting time, your bet will be settled as void, and your stake will be refunded.
Bets on tennis matches will be void only if they are not completed by the end of the tournament.
For further information about the settlement of bets on races that were postponed or canceled, you can visit the "Betting Rules" section and check term 1.17.