Prop Bets

Kinds of props

• Player props settle on one athlete’s statistic: passing yards, receptions, points, rebounds, strikeouts, shots on goal.
• Team props settle on one team’s output, such as a team total or the first team to score.
• Game props cover events within the game, such as whether there will be overtime or which half will have more points.
• Milestone and ladder props pay on reaching a threshold, such as 100+ receiving yards at +300, an implied 25%.

Most player props are quoted as over/under lines with a price on each side, such as Over 4.5 receptions at −120 and Under 4.5 at −110. The over needs five or more catches.

How props settle

Read the participation rules first. Books commonly void a player prop if the player doesn’t take part, but the definition varies: some require only a single snap or appearance, and baseball pitcher props often require the listed starter to throw at least one pitch. Overtime usually counts toward player stats, and whether a post-game stat correction changes the result depends on the book’s rules.

A player who plays and then leaves early with an injury usually still has action: if the over hasn’t hit by then, it loses.

Medians beat averages

Many player stats are skewed by occasional big games, which makes the average misleading. Take a receiver with these yardage totals over eight games: 22, 35, 41, 48, 52, 55, 61, and 112. The average is 53.25 yards, which looks like a clear over against a line of 50.5. The median is 50, and exactly four of the eight games cleared 50.5. One long game drives the average.

An over/under is a bet on which side of the line the result lands, so the median and the shape of the distribution matter more than the average.

Hit rates need context

“Over in 7 of the last 10” sounds strong, but ten games is a small sample: a 7-for-10 record is consistent with a true rate anywhere from about 40% to 89%. Before leaning on a hit rate, check:

• whether the line was the same in each game, since clearing 3.5 receptions says little about a line of 5.5;
• whether the player’s role, minutes, snaps, or spot in the batting order has changed;
• who the opponent is and how the game is expected to go, since a team expected to trail tends to pass more;
• whether a teammate’s injury or return changes the player’s opportunities.

Pricing, margin, and correlation

Props usually carry wider margins than main game lines. A −115/−115 prop implies 53.49% on each side, a 106.98% total and about 6.5% hold, compared with 4.55% on a −110/−110 spread. Some props are offered on only one side, which hides the margin entirely; the no-vig odds guide explains why those are harder to price.

Props from the same game are often correlated: a quarterback’s passing yards and the top receiver’s yards tend to rise and fall together. Treat related props as one larger position rather than as separate bets.