In horse racing and greyhound racing, an ante-post bet is a bet placed before the horse/greyhound racing course's betting market has opened, and is made on the expectation that the price of the horse/greyhound is presently more favorable than it will be when the course's market opens.
Generally, this includes any bet placed before the day of the race.
Instead, it is derived from the nineteenth century Betting Post, a stake that was traditionally fixed somewhere on the course ground like a sign-post to signal the beginning of fixed betting to bettors.
Bettors would then queue in their carriages in front of the Betting Post.
However, they often afford bookmakers significantly more press coverage, due to the variances in price.