Why odds move

Prices are not fixed. Sportsbooks move them as information and money arrive, so the price you see on Monday may not be there on Saturday.

What moves a price

• Team news. Injuries, suspensions and rotation are the classic causes.
• Money. Sportsbooks shorten an outcome when bets on it build up, to balance their risk.
• Other sportsbooks. Many follow the sharpest prices in the market, so one move can spread quickly.
• Weather and conditions. These matter most for totals markets.

Shortening and drifting

A price is shortening when it falls, for example 2.50 to 2.20. A falling price means the implied chance has gone up. A price is drifting when it rises, which means the implied chance has gone down.

How to read the Dropping odds page

The page tracks the average price per outcome across the sportsbooks we follow. It compares the current average with the first price we recorded, or with a shorter window you choose. The Drifting view shows the opposite moves.

We use the average because a single sportsbook changing one price tells you little. When most of the market moves together, something has usually changed.

What a move can and cannot tell you

A shorter price does not mean the outcome will happen. It means the market now rates it more likely. You also usually cannot tell why a price moved: it could be big bets, team news or simply one sportsbook following another.

Backing an outcome after it has shortened means taking a worse price than was available earlier. It is not automatically a good bet, and it may have become poor value.

Opening and closing prices

The opening price is the first price we recorded, which may be later than the moment the sportsbook first priced the match. The closing price is the last one before the start. Experienced bettors compare the price they took with the closing price, because regularly beating it suggests good timing. It is a useful measure over hundreds of bets and says little about a single one.