Starters averaged 5.22 innings a start in 2024. The full game moneyline asks you to bet on nine innings, and the pitcher you picked the game for is gone before the sixth. A first five innings bet settles on the score after five, which is the part of the game the starter actually pitches. If your opinion is about the pitching matchup, the F5 line is the bet that matches it.
What an F5 Bet Settles On
The first five innings market has a moneyline, a run line and a total, and all of them grade on the score at the end of the fifth inning. Innings six through nine do not exist for this bet. A team that leads 3-1 after five and loses 6-3 wins the F5 moneyline.
The F5 moneyline usually sits close to the full game moneyline. The F5 total is set at roughly half the full game total, and we will come back to why that is slightly off. Some books also post an F5 run line at -1.5 and +1.5.
If the game is tied after five, a two way F5 moneyline is usually refunded, but books differ and some offer a three way version where the tie is a third outcome. Read the rules page at your book before you bet a low scoring matchup, because ties after five are not rare.
The Starter Pitches Less Than You Think
In 2014 starters averaged 5.97 innings. By 2024 it was 5.22, and 2024 was the highest figure since 2018. The share of starts that reach five innings fell from 84% in 2005 to 70% in 2024. Only four pitchers threw 200 innings in 2024. In 2014, 34 did. In July 2026 starters averaged 5.03 innings, the lowest for any month on record.
Pitch counts explain most of it. Starters averaged 85.5 pitches in 2024 and have not averaged 90 since 2017. Teams also give their starters more rest between outings: 69.7% of 2025 starts came on five or more days of rest, against 52% in 2015.
What this means for betting is simple. When you bet a full game moneyline on a team because of its starter, more than 40% of the innings you are paying for will be thrown by someone else. The F5 bet trims that to close to zero in most games, and to one inning in the games where the starter is pulled after four.
Why the F5 Moneyline Is a Cleaner Bet on a Pitcher
A full game price is built from a starting pitcher rating and a team rating, and the team rating includes the bullpen. A team with an ace and a bad bullpen has a full game price that is dragged down by the relievers. The F5 price is built mostly from the starter and the lineup, so the ace shows up in it at closer to full value.
The reverse case is the one most people miss. A team with an ordinary starter and the best bullpen in the league has a full game price that is propped up by innings seven through nine. On the F5 line that bullpen is worth nothing, and the ordinary starter is priced as an ordinary starter. Fading that team in the first five and leaving the full game alone is a bet the full game market does not let you make.
Starters also pitch differently across their outing. They are at their best through the first 18 batters, which is twice through the order, and the trouble tends to come in the sixth. In 2018 the average starter faced 21.2 batters through five innings. The F5 bet is a bet on the stretch of the game where the starter is who you think he is.
F5 Totals and the Half Game Mistake
The F5 total is set at roughly half the full game total, and five innings is more than half of nine. In 2018 innings one through five produced 4.51 combined runs on average and innings six through nine produced 4.44. The first five are the bigger half, by a little, because the starter faces the top of the lineup twice and the late innings include some innings a home team never bats.
That does not mean every F5 over is a bet. It means that when you see a full game total of 9 and an F5 total of 4.5, the F5 number is slightly lower than a straight split would justify, and if your opinion is that the two starters are the problem rather than the bullpens, the F5 over is the cleaner way to express it. The price still has to be right.
When the Full Game Is the Better Bet
The F5 bet is not always the sharper one. If your opinion is about a bullpen, or about a lineup that wears down pitchers and does its damage late, the full game is where that opinion pays. If a starter is on a strict pitch count coming off an injury and may not see the fifth inning, the F5 bet is not a bet on him either, and the full game line may price that uncertainty better.
The F5 market is also thinner. Limits are usually lower than on the full game, and the number moves faster when sharp money arrives because the book has less handle to absorb it. Bet it when it matches your opinion, not because it feels safer.
Which Books Fit F5 Betting
First five lines are a standard part of a baseball board, so the difference between books is price and timing. BetOnline posts its baseball lines early, which matters here because the F5 line moves the moment a starter is scratched or a lineup is posted, and getting the number before that is the whole game. Both BetOnline and Bovada are offshore and outside US state regulation, so whether you can use them depends on where you live. Compare F5 tie rules and limits in our sportsbook reviews.