First five innings betting, F5 for short, settles a baseball bet on the score after five innings instead of the final score. The head to head, line and total work as they do for the whole game, but the sixth to ninth innings, extra innings and much of the relief pitching are left out.
Like any online sports bet in Australia, it has to be placed before the first pitch (Interactive Gambling Act s 8A(3) and s 10B).
How first five innings bets work
One illustrative game, Team A at home: Team A leads 3-1 after five innings, and Team B wins 5-4. With $30 on each bet:
| Bet | Price | Settles on | Result |
|---|---|---|---|
| F5 head to head, Team A | $1.65 | 3-1 after five | Wins: 30 x 1.65 = $49.50 |
| F5 total, over 4.5 runs | $1.90 | 4 runs after five | Loses $30 |
| Full-game head to head, Team A | $1.60 | 4-5 final | Loses $30 |
| Full-game total, over 8.5 runs | $1.90 | 9 runs | Wins: 30 x 1.90 = $57.00 |
A first 5 innings line is the run line over five innings: Team A -0.5 needs Team A to lead after five. An NRFI bet asks a similar question over one inning.
Why five innings isolates the starting pitchers
The first five innings are the stretch the two starters are most likely to cover, which is the point of F5: you bet the starting matchup with less of the bullpens (each club's relief pitchers) in play. Five is MLB's own benchmark for a start, too: a starter must pitch at least five innings in a game of nine innings or more to be credited with the win.
Under the NSW rule book for bookmakers authorised to take sports bets there, a nominated starting pitcher who does not start voids every bet on the game unless agreed otherwise (clause 5.2.11). Elsewhere an action bet stands against a starter you never priced. Listed pitchers explained covers both. Watch for an opener too: MLB's glossary describes a pitcher, normally a reliever, who starts the game before handing over to the pitcher who would otherwise have started, so that club's five innings belong to two pitchers.
Ties after five innings
Five innings can end level, and the market type decides what a tie does. With illustrative prices:
| Market | Team A | Tie | Team B |
|---|---|---|---|
| Three-way | $2.05 | $5.50 | $2.60 |
| Two-way (tie refunded, or a dead heat under NSW clause 5.1.8) | $1.71 | Not offered | $2.17 |
At 2-2 after five, with $30 on each selection, the three-way tie returns 30 x 5.50 = $165.00 and both three-way team bets lose. The two-way bets follow that market's tie rule: refunded where the terms refund a tie, or, under the NSW rule book for bookmakers authorised to take sports bets there, paid half their face value as a dead heat, 30 x 1.71 / 2 = $25.65 and 30 x 2.17 / 2 = $32.55 (clause 5.1.8). Team A -0.5 loses and Team B +0.5 wins. Team A -0.5 settles exactly like the three-way Team A price, so compare those two before you take either.
Rain and shortened games
MLB's glossary makes a game official once the visitors have made 15 outs with the home team ahead, or once the home team has made 15 outs. A game called before that, or called while tied, is suspended and finished later. Your bookmaker's terms decide what that does to an F5 bet:
- Five full innings played, then rain: under the common rule type it settles on the score after five.
- Called with the home team ahead after four and a half innings: the game is official, but terms differ on whether an F5 bet settles without the bottom of the fifth.
- Stopped before the fifth is finished: commonly void, though some terms keep the bet live if the game resumes within a set time.
The same NSW rule book treats an event postponed beyond three calendar days of its scheduled completion as abandoned and refunds the bets (clause 5.1.6); online bookmakers set their own terms. The MLB betting guide sets out the full-game rain rules, and US sports betting from Australia compares extra innings with overtime.
Where B337 fits
B337's Terminal shows prices from 40+ bookmakers across racing and sports. On the sports it covers, its price history (flucs) shows how each price has moved, so a price that steps after a pitching change can show up there. Not every bookmaker prices every game or market, so an F5 market may not be there. Prices are read on a repeating cycle, so confirm the price and the pitcher rule with your bookmaker before you bet. A free account opens a limited view of the Terminal with live odds.
Risk: Betting involves risk. Five innings is a short stretch in which one swing can decide the bet, and a starter scratched after you bet can leave an action bet priced for someone else. See responsible gambling for limits and support.