This is a type of wager which offers less payout but more likelihood. The golfer you select just has to place in the top 5 of a tournament (or top 10 or top 20) in order for you to win your bet.
Whatever your golfer’s outrights are just divide them by the place in which they have to finish in. For example, if your golfer is +1000 or 10 to 1 to win the golf tournament, if you divide it by 5 you will have his odds for top 5 (+200), divide it by 10 you will have his odds for top 10 (+100), etc.
Top 20 most of the time is also divided by 20 but more consistent players have higher top 20 chances. This is because it is relative to their win probability. For the most part, just divide your desired golfer’s outright chances by 20 to get an idea of their odds to finish within the top 20 of a golf tournament.