A Race to xx bet is a wager on which team will reach a certain amount of points first. If neither team reaches that given number of points before the game ends, the bet is void.
The Race to X row of bets offer options to bet the first team to score as few as five points with increasing five-point increments going up to 30 points. DraftKings gives you a three-way option to bet either team to reach the 15-point mark first, or for neither team to score 15 points in the quarter.