The final outcome of a match has the potential for a wide range of points, the over/under odds for the US Open in tennis have a wide range they can fall into. Game over/under. In the table above, the over/under is 35.5. If you bet the over, the match needs to last at least 36 games. If a match results in 6-4, 5-7, 6-7, it would put the total ...
https://sportsbook.draftkings.com/leagues/tennis/us-open-men