NRFI and YRFI are bets on one thing: whether anyone scores in the first inning of an MLB game. NRFI means “no run first inning” and YRFI means “yes run first inning.” It is one of the simplest baseball props, and also one of the easiest to overpay for.
What do NRFI and YRFI mean?
- NRFI (No Run First Inning): you win if neither team scores in the first inning.
- YRFI (Yes Run First Inning): you win if at least one run scores in the first inning, by either team.
The first inning is the top half (visiting team bats) plus the bottom half (home team bats). Any run counts, whether it comes from a home run, a single, an error or a wild pitch. Rules differ by sportsbook on rainouts and shortened games, so read your book’s house rules before betting.
How do the odds work?
Sportsbooks price each side separately, and the prices vary by game and by book. To know whether a price is fair, work out the win rate you need to break even:
| Price | Break-even win rate |
|---|---|
| +100 | 50.0% |
| -110 | 52.4% |
| -120 | 54.5% |
| -130 | 56.5% |
Here is a hypothetical example. Say a book offers NRFI at -120. A $120 bet wins $100, so you need to win more than 54.5% of the time to come out ahead. If you think a game is a true 50-50 for a scoreless first, that price is a bad deal. You can run these numbers with our betting calculators.
What should you look at before betting NRFI?
- The two starting pitchers. Season ERA is a blunt tool. Look at how each pitcher has done in the first inning specifically, and whether he has been sharper or shakier lately. Small samples mislead, so don’t lean on a handful of starts.
- The top of each lineup. Only the first three or four hitters on each side usually bat in the first inning, so the leadoff and middle-of-the-order hitters matter more than the whole roster.
- Ballpark and weather. Hitter-friendly parks and warm, windy days favour runs. Cold, heavy air favours pitchers.
- Openers and bullpen games. A team using an opener changes the usual first-inning picture. Check the confirmed starter before you bet.
- The price. A strong pitching matchup can still be a bad bet if the NRFI price already reflects it. I’d skip any bet where the number is worse than the break-even rate above.
For team-level first-inning data, TeamRankings publishes NRFI percentages by team. Check the date and sample before relying on any figure.
Is NRFI a good bet?
It can be, but not automatically. It’s popular because it’s easy to understand and the game resolves quickly, and popular props are often priced tighter. My view: treat NRFI and YRFI like any other bet. Find a price you think is wrong, bet a small, fixed amount and stop there. Don’t chase a loss with another first-inning bet.
Where does NRFI fit in your betting?
NRFI and YRFI are props, meaning bets on a specific event inside a game rather than the final result. If props are new to you, start with Sports Betting 101. For this year’s postseason, see our MLB playoff and World Series odds page.
Not every sportsbook offers first-inning props, and availability varies by book and location. 21+ only. Terms apply. Gambling problem? Call or text 1-800-MY-RESET.
