Golf Betting Glossary
Essential terms and concepts for understanding golf betting, expected value, and profitable wagering.
Expected Value (EV)
The average amount you can expect to win or lose per bet over the long run. A positive expected value (+EV) bet means you'll profit over time if you make that bet repeatedly. Calculated as: (Probability of Winning × Amount Won) - (Probability of Losing × Amount Lost).
Example
If you bet $100 at +200 odds with a true 40% win probability, your EV is: (0.40 × $200) - (0.60 × $100) = $80 - $60 = +$20 per bet.
Implied Probability
The probability of an outcome as suggested by betting odds. It represents what the sportsbook thinks the likelihood is (including their margin/vig). Convert American odds to implied probability: For positive odds like +200, divide 100 by (odds + 100). For negative odds like -150, divide the absolute value by (absolute value + 100).
Example
+200 odds = 100/(200+100) = 33.3% implied probability. -150 odds = 150/(150+100) = 60% implied probability.
Kelly Criterion
A mathematical formula for optimal bet sizing that maximizes long-term bankroll growth. It tells you what percentage of your bankroll to wager based on your edge. Formula: (Edge / Odds). Most bettors use "fractional Kelly" (typically 25%) to reduce volatility.
Example
With a 5% edge and +200 odds (3.0 decimal), full Kelly = 5% / 2 = 2.5% of bankroll. Quarter Kelly = 0.625% of bankroll.
Calibration
The process of adjusting raw model probabilities to match real-world outcomes. Golf betting models are often overconfident, so we multiply probabilities by a calibration factor (e.g., 0.85x for tournament matchups) based on historical performance.
Example
If the model says a player has a 40% chance to make the cut, but historically those predictions only won 40% of the time after applying 1.0x calibration, we use 40% directly. If they only won 34% of the time, we'd calibrate at 0.85x, making the adjusted probability 34%.
Edge
The advantage you have over the sportsbook. It's the difference between the true probability and the implied probability. A positive edge means you have a better estimate than the book.
Example
If your model says a player has a 35% chance to finish top 10, but the sportsbook odds imply only 30%, you have a +5 percentage point edge, or a 16.7% relative edge.
Closing Line Value (CLV)
The difference between the odds you got when you placed your bet versus the odds available just before the event starts. Consistently beating the closing line is a strong indicator of long-term profitability.
Example
You bet Scottie Scheffler at +800 on Monday. By Thursday his odds are +600. You gained closing line value because you got better odds earlier.
Vig (Vigorish/Juice)
The commission the sportsbook charges, built into the odds. It's why the implied probabilities of all outcomes add up to more than 100%. Also called "overround".
Example
Both sides of a matchup are offered at -110 (52.4% implied each). 52.4% + 52.4% = 104.8%. That extra 4.8% is the vig.
American Odds
The odds format used by US sportsbooks. Positive numbers (+200) show how much profit you make on a $100 bet. Negative numbers (-150) show how much you need to bet to win $100.
Example
+200 means bet $100 to win $200 profit ($300 total return). -150 means bet $150 to win $100 profit ($250 total return).
Decimal Odds
The total return you receive per dollar wagered, including your original stake. Common in Europe and among sharps because they're easier to calculate with.
Example
3.0 decimal odds means you get $3 back for every $1 wagered (including your stake). This equals +200 American odds.
Bankroll
The total amount of money you have set aside specifically for betting. This should be money you can afford to lose. Proper bankroll management is key to long-term success.
Example
If you have $2,000 set aside for golf betting and use quarter Kelly staking, a 1% Kelly bet would be $2,000 × 0.01 × 0.25 = $5.
Variance
The natural swings and fluctuations in results due to random chance. Even +EV bets lose frequently in the short term. High variance means larger swings; low variance means more consistent results.
Example
Betting tournament winners (high variance) will have bigger swings than betting make cut (low variance), even with the same edge.
Sharp vs Square
Sharp bettors are skilled, professional, or informed bettors who beat the closing line and show long-term profit. Square bettors are recreational bettors who typically lose long-term. Sportsbooks adjust odds based on sharp action.
Example
Sharp money moves lines significantly. If sharps bet a player at +800 and the line moves to +600, that's a signal of where the smart money is.
Arbitrage
A betting strategy where you place bets on all possible outcomes across different sportsbooks to guarantee a profit regardless of the result. Requires finding odds discrepancies between books.
Example
Player A at -105 on one book, Player B at +120 on another book in a matchup. Betting both guarantees profit no matter who wins.
Outright
A bet on a player to achieve a specific outcome in the entire tournament, such as winning, finishing top 5, top 10, top 20, or making/missing the cut.
Example
Betting Rory McIlroy to finish top 10 at the Masters is an outright bet.
Matchup
A head-to-head bet between two or more players. You're betting on which player will finish with the better score. Can be for the full tournament, a single round (2-ball), or a 3-ball.
Example
Scottie Scheffler vs Rory McIlroy tournament matchup at -115. You're betting on who finishes higher on the leaderboard.
2-Ball
A head-to-head bet between two players for a single round of golf. Unlike tournament matchups, only that round's score matters.
Example
Jordan Spieth vs Collin Morikawa Round 2 2-ball. Only their Round 2 scores determine the winner.
3-Ball
A matchup bet between the three players grouped together for a specific round. You're betting on which of the three will have the lowest score for that round only.
Example
Round 1 3-Ball: Player A -110, Player B +200, Player C +250. You're betting on who shoots the lowest score in Round 1 among these three.
Dead Heat
When two or more players tie for a finishing position. Your stake is divided by the number of tied players, and that fraction is paid out at full odds.
Example
You bet $100 on a player to finish top 5 at +200. Three players tie for 5th. Your stake is divided by 3: ($100/3) × 3.0 = $100 return, no profit.
Each Way (E/W)
A type of bet common in golf where your stake is split in two: half on the player to win, half on the player to place (usually top 5 or top 8). The place portion pays at reduced odds, typically 1/4 or 1/5 of the win odds.
Example
$100 E/W on a player at +2000 (1/4 odds for top 5) = $50 to win + $50 to place. If they finish 3rd, you lose the win bet but win: $50 × 6.0 = $300 on the place portion.
Make Cut / Miss Cut
A bet on whether a player will make or miss the cut after the first two rounds. Typically the top 65 players and ties (or top 70 for some events) make the cut and play the weekend.
Example
Betting Viktor Hovland to make the cut at -400 means you need to risk $400 to win $100, but he only needs to be in the top ~65 after 36 holes.
DFS (Daily Fantasy Sports)
Fantasy contests where you draft a lineup of players for a single event or slate of events. Popular DFS sites include DraftKings and FanDuel. Different from traditional betting but uses similar analysis.
Example
Building a 6-player golf lineup on DraftKings with a $50,000 salary cap for the US Open.
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