Bettors have a few different options for the U.S. Open, starting with the futures markets mentioned above (which player will win the tournament).

Three primary markets are available for each match — the moneyline, spread and total. For the moneyline, bettors simply select the player they think will win the match. One player will be listed as the favorite while the other will be the underdog.

The spread is based on whether a player will win by a certain number of games. For example, if a player is -1.5 on the spread, they need to win by two or more games to cover.

Some sportsbooks also offer lines on sets instead of games. Depending on the moneyline, bettors could see the set spread at 1.5 or 2.5. The former number will be used in matches expected to be closer (the moneyline favorite may be priced around -200), whereas the latter will be used for more lopsided matches.

A heavy moneyline favorite could enter at -700 or higher. Thus, you’re effectively betting on whether the heavy favorite will win in straight sets. Most of the early-round matches will have heavier favorites before the margins get tighter as the tournament progresses.

Then there’s the total, which is the total number of games played in the match. If a bettor believes there will be more games than the total set by bookmakers, they should bet the Over. If they believe the total games will be fewer, they should bet the Under.

There will also many prop bets available for each match, where bettors can wager on everything from the correct score to who will win a specific set. These bets are intended for more advanced bettors, as they require more research and knowledge about the match.