MLB NRFI & YRFI Picks Today: The Guardians-Tigers First Inning Is Thursday's Best Price (August 13)
Thursday, August 13 is a getaway-day MLB card: six of the nine games on the OddsShopper first-inning odds screen are underway before 4:30 PM ET, four of them in the 1-o'clock hour. It is also a looser board than we've had. Three of the 18 first-inning sides beat their fair, no-vig price, where Tuesday's much larger card produced exactly one. Two of those three are matinees. The third is the 10:10 PM ET nightcap, the latest and most heavily bet game on the card, which is the last place a soft first-inning price is supposed to survive. That exception turns out to be the most useful thing on the board, and explaining it is most of this article. One market here is also priced so thin that its two best numbers add up to less than a whole. If NRFI is new to you, the what is NRFI explainer is the five-minute version; everything below assumes it.
The Quick Answer
Three first-inning sides beat their fair (no-vig) price on Thursday, August 13, and the best of them is the Cleveland Guardians vs. Detroit Tigers YRFI at +122, against a true price of +118, a +1.9% edge on a 1:10 PM ET first pitch. Behind it: the Milwaukee Brewers vs. Los Angeles Dodgers NRFI at +102 (true -101, +1.7%) in the 10:10 PM ET nightcap, and the Seattle Mariners vs. New York Yankees YRFI at +128 (true +127, a marginal +0.4%). The other 15 sides price at or below fair. The full 18-side board, the reason the Guardians-Tigers market is the only one on the card whose combined price leaves a margin before a pitch is thrown, and the dollars-and-cents math on a +1.9% edge are all below.
Thursday's First-Inning Board: All 18 Sides, Ranked By Edge
Read the edge column before the team names. A positive edge means the best takeable price pays more than the true, devigged probability says it should. That's value. A negative edge means the price is shorter than fair and the market is efficient there: no play, however tempting the pitching matchup looks. Here is the whole nine-game card, best side to worst.
| Game (First Pitch, ET) | Side | Best takeable | Fair (no-vig) | Edge |
|---|---|---|---|---|
| Guardians Vs. Tigers (1:10 PM) | YRFI | +122 | +118 | +1.9% |
| Brewers Vs. Dodgers (10:10 PM) | NRFI | +102 | -101 | +1.7% |
| Mariners Vs. Yankees (1:35 PM) | YRFI | +128 | +127 | +0.4% |
| Guardians Vs. Tigers (1:10 PM) | NRFI | -120 | -118 | -0.8% |
| Rangers Vs. Angels (10:07 PM) | NRFI | -128 | -124 | -1.4% |
| Brewers Vs. Dodgers (10:10 PM) | YRFI | -102 | +101 | -1.7% |
| Phillies Vs. Twins (7:30 PM) | NRFI | +100 | +104 | -2.0% |
| Cubs Vs. Nationals (4:05 PM) | YRFI | +100 | +104 | -2.0% |
| Mariners Vs. Yankees (1:35 PM) | NRFI | -135 | -127 | -2.6% |
| Reds Vs. White Sox (1:10 PM) | NRFI | -107 | -101 | -2.6% |
| Phillies Vs. Twins (7:30 PM) | YRFI | -110 | -104 | -2.7% |
| Red Sox Vs. Blue Jays (3:07 PM) | YRFI | +110 | +116 | -2.7% |
| Pirates Vs. Marlins (1:10 PM) | NRFI | -121 | -114 | -2.9% |
| Reds Vs. White Sox (1:10 PM) | YRFI | -105 | +101 | -3.0% |
| Red Sox Vs. Blue Jays (3:07 PM) | NRFI | -125 | -116 | -3.4% |
| Cubs Vs. Nationals (4:05 PM) | NRFI | -113 | -104 | -3.9% |
| Rangers Vs. Angels (10:07 PM) | YRFI | +115 | +124 | -4.0% |
| Pirates Vs. Marlins (1:10 PM) | YRFI | +105 | +114 | -4.0% |
The row I keep coming back to is the top one, and the reason is the second column of that same game. Guardians-Tigers holds the day's best row at +1.9% and its fourth-best at -0.8%, so both halves are priced close to honest. Only Brewers-Dodgers, at +1.7% and -1.7%, keeps that company; every one of the seven remaining games has at least one side costing 2.6% or more over the odds. What that tightness is worth, and why those two games have it, is specific enough to earn the next section.
The Guardians-Tigers Market Is The Only One Priced Under 100%
Every two-way market carries a toll. Convert both best takeable prices to implied probability, add them, and the amount over 100% is what the market charges you for the privilege of playing. Run that across all nine games and Thursday sorts cleanly:
| Market | Combined implied (both best prices) |
|---|---|
| Guardians Vs. Tigers | 99.6% |
| Brewers Vs. Dodgers | 100.0% |
| Mariners Vs. Yankees | 101.3% |
| Phillies Vs. Twins | 102.4% |
| Rangers Vs. Angels | 102.7% |
| Reds Vs. White Sox | 102.9% |
| Cubs Vs. Nationals | 103.1% |
| Red Sox Vs. Blue Jays | 103.2% |
| Pirates Vs. Marlins | 103.5% |
Guardians-Tigers is not just the cheapest market on the board. At 99.6% it is on the wrong side of a whole: the -120 NRFI implies 54.6%, the +122 YRFI implies 45.0%, and those two numbers do not add up to the certainty that the first inning either will or won't produce a run. That gap is the shape the Arbitrage tool screens the board for, and three honest caveats belong with it:
- It Only Exists Across Two Books. A sub-100% market means nothing unless both prices are live at different sportsbooks at the same moment.
- A 0.4% Margin Is Fragile. A limit, a late line move, or one posted lineup erases it before you can get down on both halves.
- Books Notice. Accounts that repeatedly hunt these gaps can get limited, which is why this is a diagnostic rather than a strategy.
What the 99.6% tells you reliably is that this particular market is soft, which is why the value showed up here and not in the 103.5% Pirates-Marlins market, where the toll swallows any soft price before it can print as an edge. That's one way value appears on a first-inning board. Thursday happens to contain the other one too, and the two are worth telling apart.
Brewers-Dodgers Shows The Other Way Value Appears
The Brewers-Dodgers 10:10 PM ET nightcap combines to exactly 100.0%, a zero-toll market and in theory the fairest price on the card, and its NRFI still prints a +1.7% edge at +102. That looks like a contradiction until you notice the two numbers come from different places. The 100.0% is the market's own split of the two prices against each other. The +1.7% comes from comparing the takeable +102 against a true price of -101, which is where the model's no-vig line lands after weighing sharper books. Those disagree by about three quarters of a point of probability, 49.5% against 50.2%, which at the rounded prices is worth roughly a cent and a half on the dollar; the board prints +1.7% off its unrounded true number. That disagreement is the entire edge, and it is why the latest, sharpest-priced game on the card can still carry the board's second-best row.
So the card offers two distinct origins of value on the same night, and they show up in different columns:
| Origin Of The Edge | Thursday's example | What tips you off | How it dies |
|---|---|---|---|
| Toll Fell Off | Guardians-Tigers YRFI +122, +1.9% | Combined implied dips under 100% (99.6%) | The toll returns as money arrives |
| Market Split The Halves Wrong | Brewers-Dodgers NRFI +102, +1.7% | Takeable price beats the true no-vig number even at a fair toll | Sharp money corrects the split |
Both games are cheap, and that's the point worth holding onto: all three of Thursday's edges sit in the card's three cheapest markets, at 99.6%, 100.0% and 101.3%. But cheap is only where an edge can survive, not where it comes from. In Guardians-Tigers the toll itself fell off and a soft price got through. Brewers-Dodgers charges no toll at all yet still pays, because the model thinks the market split the two halves slightly wrong. The first kind you find by looking at the toll column. The second kind only shows up if you have a fair price to compare against, which is what a devig does and why the true-odds column exists on the screen at all. Our how to find +EV bets guide walks the full method.
The Mariners-Yankees YRFI is the honest footnote to both. At +128 against a true +127, it clears fair by four tenths of a percent. That is a price alert, not a play. One cent of line movement and it isn't value anymore.
Worked Example: What A +1.9% Edge Actually Pays At +122
Take the Guardians-Tigers YRFI and run the two steps the odds screen runs continuously:
- Best takeable +122 → a winning $1 risk returns $2.22, stake included
- Fair (no-vig) +118 → the market's honest estimate of at least one run in that first inning is 45.9%
Multiply $2.22 by 45.9% and you get back about $1.018 per dollar risked, roughly 1.8 cents of theoretical profit on the dollar. The board rounds that to +1.9% off its unrounded true price. Not a windfall, but a real number that compounds if you only ever accept prices on this side of fair.
Now run the identical arithmetic on the board's worst row, the Pirates-Marlins YRFI. It pays +105, so $1 returns $2.05; its fair price of +114 implies a 46.7% chance; and 2.05 × 0.467 hands back about 96 cents. Same bet type, same afternoon, two games that both start at 1:10 PM ET, and the difference between earning about two cents and burning about four is nothing but the number you accepted. That is the whole argument for reading the edge column instead of the matchup notes.
Read the first-inning board the way this article just did. OddsShopper lines up every major book's NRFI and YRFI price, devigs each market to its true number, and flags the sides paying more than their fair chance — the test run 18 times above, done across every book in seconds. Code NRFI takes 20% off your first month of OddsShopper Pro.
Where Thursday's Board Says No
Fifteen of 18 sides are the market telling you it has this one priced. Run the two-origins test backwards on the bottom two rows and you can see exactly why each fails, which is more useful than knowing that they do:
- Rangers Vs. Angels YRFI (+115, True +124, -4.0%). Fails both tests at once. The market carries a 102.7% toll, so nothing soft survives it, and the model separately has the price nine cents short of fair. Plus money on a 10:07 PM ET Angels game is exactly the row that gets taken on the number's appearance rather than its size.
- Pirates Vs. Marlins YRFI (+105, True +114, -4.0%). Fails the toll test hardest: 103.5% combined, the most expensive market on the card. It is also nine cents short, which ties it with Rangers-Angels for the widest gap on the board.
Neither is a signal to take the other side. A -4.0% YRFI does not make its NRFI a bet: the Pirates-Marlins NRFI is -2.9% and the Rangers-Angels NRFI is -1.4%, both no.
For the full-game side of Thursday's nine, the live odds screen — shop the number across every major book runs the same fair-price test on moneylines and totals. Holding a free bet from a book promo and no first-inning number you like? The free bet converter shows what it's actually worth in withdrawable cash. And for a human card alongside the math, browse the free expert picks today.
A Few Realities Before You Play A First-Inning Number
- The Edge Lives In The Price, Not The Pick. At +122 with a 45.9% true chance, roughly 54 of every 100 of these lose, and the +1.9% only exists while you're still getting +122. Four cents of line movement and the Guardians-Tigers YRFI is priced like the Pirates-Marlins row this article just rejected. That, not generic caution, is why you recheck at the pregame window.
- The Bet Resolves In Six Outs Or Fewer. First-inning markets are the smallest sample in baseball betting. Variance dominates any single night, whatever the edge column says.
- Getaway-Day Lineups Move These Numbers Hard. These prices are as of this writing, on a card where six games start before 4:30 PM ET. A posted lineup resting a middle-of-the-order bat can flip a +1.9% to the wrong side of fair, and matinee lineups post late. Recheck the screen inside each game's pregame window.
- Play Responsibly. Sports betting is for adults 21+ in regulated markets where it is legal. Even positive-edge prices lose often. Bet within your means and never chase losses.
FAQ
What does NRFI mean in betting? NRFI stands for No Runs First Inning, a yes/no bet that neither team scores in the first, both halves combined. If either team plates a run, NRFI loses and YRFI (Yes Runs First Inning) wins; nothing after the first inning counts. On Thursday's card the nine NRFI prices run from -135 (Mariners-Yankees) to +102 (Brewers-Dodgers), and only one of the nine beats its fair number. The MLB betting terms glossary covers the rest of the vocabulary.
What is the best NRFI pick today? By edge, it's the Brewers vs. Dodgers NRFI at +102 against a true -101, a +1.7% edge in the 10:10 PM ET nightcap. It's the only NRFI on the board that clears fair, and it gets there a different way than the day's best row does: Brewers-Dodgers charges no toll at all, combining to exactly 100.0%, so the edge is entirely the model's no-vig line disagreeing with how the market split that game's two halves.
Are there any YRFI picks today? Two clear fair. The Guardians vs. Tigers YRFI at +122 against a true +118 is the board's best side at +1.9%, and the Mariners vs. Yankees YRFI at +128 against a true +127 clears by a marginal +0.4%. Both are early-afternoon first pitches, at 1:10 and 1:35 PM ET, so the pregame window on each is short. YRFI drew all three edges on August 9 too: that edition ran the same way.
Why does the edge column go negative on most games? Because first-inning markets price efficiently most days, and only three of Thursday's 18 sides escaped that. A negative edge is not a lean toward the other side; it's the board saying no price in that market beats fair, so the play is no play. Tuesday's edition was the extreme version of the same message: one side cleared out of 30, by three tenths of a percent.
What does a market priced under 100% actually mean? It means the two best numbers, taken together, leave a small margin. Guardians-Tigers at 99.6% is Thursday's only example, and it is not something to treat as easy value. Capturing that margin requires both prices live at different books at the same moment, at stakes each book will accept, before either number moves, and books restrict accounts that hunt these gaps repeatedly. The durable, actionable read is simpler: a sub-100% price is evidence that market is soft, which is why the day's best edge showed up there.
Bottom Line
Thursday's getaway-day card is looser than Tuesday's was, and it loosened in a specific place. Three of 18 sides beat fair, the two that matter sit in the card's two cheapest markets, and the cheapest of them — Guardians-Tigers at a 99.6% combined price — is the only market all day whose two best numbers don't add up to a whole. Tuesday's board had 30 sides and produced one hairline edge with nothing under 100%; the matinee in Detroit is softer than anything that was on Tuesday's card. The order of operations doesn't change: find the cheap market, then check whether the price still beats fair when you're ready to act. The screen does both, every morning, before the first pitches of the day.
Get the first-inning board devigged for you. OddsShopper prices every book's NRFI and YRFI on the first-inning odds screen and flags any side beating its true odds the moment one appears. Code NRFI takes 20% off your first month of OddsShopper Pro. Bet responsibly, 21+ where legal.
