What does a -2.2% edge mean?

A negative edge of -2.2% means the price (-500) is worse than fair value (-441). You can still win, but the long-run math is against you.

Does a positive edge mean the bet is likely to win?

No. The market still implies about a 83.3% chance this hits at the offered odds. A +EV bet pays more than its true probability warrants — most +EV bets at long odds still lose individually.

How are fair odds calculated?

Sportsbook prices on the same market are de-vigged and averaged to estimate a true win probability. Using the available market price, we estimate 81.5%, which converts to fair odds of -441.

Why does this grade differ from the sportsbook's advertised lift?

Books quote lifts vs their own original line, which already includes margin. We compare the price to a vig-free consensus, so an advertised lift can still grade poorly if the underlying line was inflated.

Should I bet every bet that grades well?

Grading is a price-quality signal, not a guarantee. Even a B-grade bet can lose. Size within your bankroll, account for correlation, and don't chase results.

I. Swiatek Match winner — B Grade — Modest Edge Play (50/100)

All analyses

AiOddsLab

Bet365

Better Off PassingBalancedB

Price or risk doesn't justify it

I. Swiatek Match winner

Unconfirmed value. Could win, could lose — but it's a feel play, not a data play.

Stake idea · Balanced

0.5u · Half

Reasonable spot — half a unit keeps it fun.

Your odds

-500

Fair odds

-441

Edge

—

Settle the debate

One brand · 3 sizes

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Inside angles

Researching…

Pulling weather, lineups, head-to-head, and schedule spots…

Angles are surfaced only when backed by a specific fact. Verify lineups and weather close to game time.

AI breakdown

Verdict: the matchup on a strong favorite like Iga Swiatek can be a solid foundation for any tennis bet slip!

Value: the matchup there's no direct comparable market consensus for an exact edge calculation, your offered price of -500 aligns with expectations for a dominant player in this spot.
Market context: The -500 offer reflects a strong market belief in Iga the matchup win probability, as often seen with top-tier athletes.
Status: the matchup is no notable injury signal for Iga Swiatek.
Social: the matchup isn't significant social media buzz on this specific bet to note.
Risk: 1-leg parlay variance. With 1 independent conditions required, hit rate compounds quickly and one miss voids the ticket. No verifiable correlation signal from the inputs provided.

Smart insight: With single-leg favorites, the key dynamic is often about how her opponent's form or any unexpected match dynamics might influence the outcome, rather than the matchup own baseline performance. Similar profile: This is a standard single-leg moneyline bet on a heavy favorite in a tennis match, a common market for bettors confident in a top player's ability. Counter-case: The primary counter-case is always the potential for an upset in tennis, where even heavy favorites can occasionally drop a match due to various factors on a given day. Live context: the matchup lineups near tip-off.

Stake suggestion: the matchup stake.

How this bet was graded

Grade B · 50/100 · Better Off Passing

I. Swiatek Match winner at -500 on Bet365: we couldn't match this slip to enough comparable market prices to compute a trustworthy consensus fair value, so no edge % is shown — anything we'd print would just echo the book's own vig. The grade leans on price lift vs the original (+0.0%), leg count, and variance. Treat it as directional.

Frequently asked questions

Why isn't an edge % shown?

We couldn't match this slip to enough comparable market prices to compute a trustworthy fair value. Rather than show a number derived from the offered price itself (which would just echo the book's vig), we leave the edge unstated. The grade still reflects price lift vs the original, variance, and confidence.

Does the grade still mean something?

Yes. B (50/100) is built from the price lift, leg count, variance, and any verified context signals — it's directional. Treat it as a sanity check, not a precise EV figure.

Should I bet every A-grade ticket?

Grading is a price-quality signal, not a prediction. Even an B-grade ticket can lose. Size within your bankroll, account for correlation between legs, and use Inside Angles above to spot factors the price hasn't absorbed yet.