The event needs an eligibility rule
A complete first-goalscorer market defines the qualifying period, eligible players, participation threshold, treatment of substitutes, own goals, no-goalscorer outcome, dead heats, and abandoned matches. Betfair's current football rules provide one operator example with explicit goalscorer and non-participant rules.
Own goals are not automatically credited
Under the current Betfair rule example, own goals are ignored for first and last goalscorer settlement. The next eligible scorer can become the first goalscorer for the product. That is different from treating the player who conceded the own goal as the scorer.
Other operators can specify their own treatment. DraftKings' soccer rules are a second current operator reference; the accepted market contract takes priority.
Participation states
| Player state | Question to answer from current rules |
|---|---|
| Starts | Is the selection live from kickoff? |
| Enters before first qualifying goal | Is the player eligible to be first scorer? |
| Enters after first qualifying goal | Is the first-scorer selection already lost or void? |
| Named but never plays | Is the selection void or all-in? |
| Leaves before any goal | Does the selection remain live? |
Do not assume one universal non-runner outcome. Store the team sheet, substitution times, first qualifying goal time, and operator rule that applied.
Sportmonks' lineup documentation distinguishes confirmed and predicted lineups and exposes confirmation metadata. A predicted lineup is not evidence that a player participated.
No goalscorer and 0-0
A 0-0 match needs an explicit no-goalscorer or no-goal settlement rule. The same applies when every recorded goal is excluded by the market's own-goal definition. Preserve whether No Goalscorer is a listed selection, an implicit winning outcome, or a void condition.
Return example
For an illustrative GBP 5 stake at decimal odds 7.00:
Gross return = 5 * 7 = 35
Net profit = 35 - 5 = 30
The return applies only when the named player satisfies both participation and first-eligible-scorer rules.
Correct accumulator arithmetic
Five selections each at decimal odds 1.50 have combined decimal odds:
Combined odds = 1.50 * 1.50 * 1.50 * 1.50 * 1.50 = 7.59375
If each price were fair and the five events were independent, each implied probability would be 1 / 1.50 = 0.666667. The joint probability would be:
Joint probability = 0.666667 * 0.666667 * 0.666667 * 0.666667 * 0.666667 = 0.131687
That is about 13.17%, not 57%. OpenStax explains that multiplying probabilities requires independence. Real prices include margin and goalscorer events can share team, match, and lineup information, so even 13.17% is only a stated-assumption illustration.
Probability record
A player probability needs expected minutes, starting status, team scoring distribution, set-piece role, eligible-scorer rules, and an evaluation cutoff. Store a direct first-scorer probability rather than substituting goals per 90 or anytime-scorer probability.
Expected value then uses the named player's first-scorer probability and complete payoff. OpenStax's expected-value chapter provides the weighted-payoff principle.
Verification checklist
- Save the confirmed participant state and time of entry.
- Confirm own-goal and no-goalscorer treatment.
- Confirm the qualifying period and first eligible goal.
- Apply dead-heat and abandoned-match rules.
- Record the accepted price and stake.
- For multiples, calculate combined price and joint probability separately.
Next step
Use Scorecast Betting for the next part of this topic.
Continue learning
- Next guide: Football Card Betting
- Related guide: Football Combo Markets
Assumptions and limitations
Prices and accumulator inputs are illustrative. Product rules change across operators and dates. This guide does not identify a player selection or claim that lineup, xG, or scoring-rate data alone produce a reliable first-goalscorer forecast.
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