Start Here: A First Five Bet Is A Whole Separate Game
When you open a baseball game on a sportsbook you see a moneyline, a run line and a total. Scroll a little further and there is a second set of the same three markets labelled 1st 5 Innings, or F5. Most people scroll past it. Today's biggest play lives there, so it is worth understanding.
A first five bet treats innings one through five as if they were the entire game. Whatever the score is when the fifth inning ends, that is your result. The sixth through the ninth might as well not happen.
Three things follow from that and all three matter.
1. It settles early
Your bet is graded when the fifth inning is complete, usually around ninety minutes in. A ninth inning comeback cannot save you and cannot beat you. That cuts both ways and new bettors usually only notice the good half.
2. The bullpen is not on your ticket
This is the real reason the market exists. In a normal nine inning bet you are betting on two starting pitchers and then on four or five relievers you may never have heard of. On a first five bet you are betting on the two starters and almost nothing else. Tonight that means Logan Webb and Paul Skenes, and not whoever Pittsburgh brings in later.
3. The numbers are smaller, so the same runs matter more
A full game total tonight is 7.5. The first five total on the same game is 4.5. One extra run is worth far more against a 4.5 than against a 7.5, and a single crooked inning can end a first five bet on its own.
How Often Does A First Five Under Actually Win?
This is checkable, so we checked it. Across 2,070 games this season, here is how often the combined score through five innings finished under each number.
| First five under | Games it hit | How often |
|---|---|---|
| Under 3.5 | 781 of 2,070 | 37.73% |
| Under 4.5 | 1,036 of 2,070 | 50.05% |
| Under 5.5 | 1,270 of 2,070 | 61.35% |
Read that middle row carefully, because it is the honest part. An under 4.5 through five innings is a coin flip at the league average. Not a lock, not a trap. Exactly even.
So the play tonight is not a bet on the market being soft. It is a bet on these two specific pitchers being much better than the average two pitchers. At -154 the bet has to win about 60.6 percent of the time to be worth making, which is more than ten points above that coin flip. Webb and Skenes are the entire argument for the gap.
The Other New Thing: A Run Line Set On A Whole Number
You already know the standard run line. It is minus 1.5, and the favourite has to win by two or more. Two of today's four plays are set at minus 1 instead, which is a number most American books do not print at all.
Here is the difference in one table, using a favourite that wins the game.
| If the favourite wins by | On minus 1.5 | On minus 1 |
|---|---|---|
| 1 run | Loss | Push, stake returned |
| 2 runs | Win | Win |
| 3 or more | Win | Win |
A push means nobody wins. Your money comes back exactly as it went in. On a whole number line that is what happens whenever the game lands on the number, and one run wins are the single most common result in baseball.
That is why the whole number is worth reaching for. It costs less than backing the same team on the moneyline and it turns the most likely losing outcome into no outcome at all. The catch is availability. DraftKings and FanDuel jump from the moneyline straight to minus 1.5 with nothing in between, so minus 1 usually has to be found elsewhere.
Today Card, Line By Line
Giants and Pirates first five innings under 4.5, -154, 3 units. Logan Webb has a 3.72 ERA and a 1.10 WHIP this season. Paul Skenes has a 3.79 ERA, a 1.12 WHIP and 175 strikeouts. A WHIP near 1.10 means roughly one baserunner an inning. Two of those at once is the reason the number is low and the reason the bet exists.
Rangers minus 1, -160, 2.5 units. Texas has to beat the Athletics by two. A one run win refunds. The argument is Oakland's starter, Brady Basso, who has thrown 28 innings all season across three starts.
Guardians minus 1, -130, 1.5 units. Same structure, cheaper price. Cleveland's Gavin Williams has 204 strikeouts in 156 innings. Toronto counters with Spencer Miles, who has been good but has made only five career starts.
Rays moneyline, -125, 1.5 units. The simplest bet on the card. Tampa Bay just has to win. It is also the smallest, because the pitching argument here is the thinnest of the four.
The Money, In Plain Numbers
Every unit figure above is to win, not to risk. That distinction trips up more new bettors than anything else on this page. At -154, winning 3 units means putting up 4.62.
| Play | To win | You put up |
|---|---|---|
| Giants/Pirates F5 under 4.5, -154 | 3.0 | 4.62 |
| Rangers minus 1, -160 | 2.5 | 4.00 |
| Guardians minus 1, -130 | 1.5 | 1.95 |
| Rays moneyline, -125 | 1.5 | 1.88 |
| Whole card | 8.50 | 12.45 |
Risking 12.45 to win 8.50 means the card needs to be right 59.4 percent of the time just to come out level. That is the number to keep in your head when a card is made entirely of favourites. Being right more often than you are wrong is not the same thing as making money.
Yesterday, For Context
Yesterday's four play card went 2-2 and still made 0.78 units. Texas at minus 1 won the game 8-1 so the whole number never came into it, and the Astros moneyline cashed 6-3. The two losses were a smaller under and a moneyline priced at -168. Winning the two biggest bets and losing the two smallest is how a .500 day finishes green, and it is the whole reason bet sizing gets talked about as much as bet selection.