Go the Distance
To “go the distance” means the fight lasts all scheduled rounds, resulting in a decision by the judges. A bet on “fight goes the distance – yes” means you expect no knockout and the judges will decide the winner.
The over/under was 10.5 rounds, and you believed neither man would be knocked out, so you bet the fight will **go the distance**. Indeed, after 12 rounds, it goes to the scorecards – your bet wins. Conversely, a late-round KO would mean it did *not* go the distance, defeating the bet.