NBA ATS Records: How Often Do Favourites and Underdogs Cover?
Across 7,918 NBA games with a closing spread, neither favourites nor underdogs beat the bookmaker's cut. The edges people chase look like noise once you see the full spread bands.
Every NBA bettor carries a theory about underdogs. Points are cheap and late runs are common, so the dog with the points should get there more often than the market thinks. I tested that against six years of closing lines, broken down by spread size, venue and season. Before I lean on any angle for my NBA betting tips page, it has to survive a test like this.
The headline answer is flat. Underdogs covered 49.6% of non-push games, and favourites covered close to the other half. At -110 you need 52.4% just to break even, so backing every underdog returned โ5.3% and backing every favourite returned โ3.7%. The closing line is very hard to beat with a blanket rule, and the charts below show why.
Cover, push or fail across every closing spread band
This chart shows every game from the favourite's side, split into favourite cover, push and underdog cover for each band of spread. The first thing I notice is how little changes from band to band. From one-possession lines up to double-digit favourites, the split stays close to even. Only 1.5% of games landed exactly on the number, partly because consensus closing lines include quarter-points that cannot push.
View the data: cover, push or fail by size of spread
| Favourite covered | Push | Underdog covered | |
|---|---|---|---|
| -1 to -2.5 | 50.0% | 1.4% | 48.6% |
| -3 to -4.5 | 49.7% | 1.6% | 48.7% |
| -5 to -6.5 | 49.0% | 1.5% | 49.5% |
| -7 to -9.5 | 50.1% | 1.3% | 48.6% |
| -10 to -12.5 | 48.0% | 1.6% | 50.4% |
| -13 or more | 51.8% | 1.7% | 46.5% |
The one band that stands out is -13 or more, where favourites covered 52.6% of non-push games across 595 games. That is a smaller sample than the bands in the middle, and even that figure only just clears the break-even mark. Big favourites may keep their foot down more than people expect, but I would not build a staking plan on one band.
Home and road favourites split by spread size
Venue is the next thing bettors reach for. Across all bands, home favourites covered 50.3% of non-push games over 4,762 games and road favourites covered 50.6% over 2,969 games. On the whole sample, home court is priced in almost exactly.
The band-by-band view looks more dramatic. Among favourites of -10 to -12.5, home favourites covered 47.1% while road favourites covered 53.2%. Then at -13 or more the order reverses, with home favourites at 54% and road favourites below half.
Neutral-site games excluded. Road favourites of -13 or more are a small sample.
View the data: home vs road favourites against the spread
| Home favourite | Road favourite | |
|---|---|---|
| -1 to -2.5 (802 home / 775 road) | 51.5% | 50.3% |
| -3 to -4.5 (961 home / 698 road) | 49.8% | 50.9% |
| -5 to -6.5 (890 home / 560 road) | 50.4% | 49.2% |
| -7 to -9.5 (1,045 home / 517 road) | 50.0% | 51.6% |
| -10 to -12.5 (624 home / 271 road) | 47.1% | 53.2% |
| -13 or more (440 home / 148 road) | 54.0% | 48.3% |
When the gaps keep switching direction from one band to the next, I read that as scatter, not a trend. The road side of the biggest band rests on only 148 games, so a handful of garbage-time buckets can move it a long way. I would want a reason in rest, travel or pace before trusting any of these splits.
What flat -110 bets returned in each spread band
This is the chart that matters for your bankroll. It assumes a flat stake at -110 on every game in each band, with pushes refunded. Almost every bar is red on both sides. The bookmaker's margin does exactly what it is designed to do.
Only one bar finishes positive. Backing favourites of -13 or more returned 0.5%, while backing the underdogs in that same band produced the heaviest loss on the chart. The kindest result for dogs came at -10 to -12.5, a much smaller loss, but still a losing figure.
Assumes -110 on both sides; the dataset has no spread prices. Pushes refunded.
View the data: flat -110 return by spread band
| Back the favourite | Back the underdog | |
|---|---|---|
| -1 to -2.5 | โ3.2% | โ5.8% |
| -3 to -4.5 | โ3.5% | โ5.5% |
| -5 to -6.5 | โ4.9% | โ4.0% |
| -7 to -9.5 | โ3.1% | โ5.9% |
| -10 to -12.5 | โ6.8% | โ2.1% |
| -13 or more | +0.5% | โ9.4% |
| All games | โ3.7% | โ5.3% |
The main caveat sits here. The dataset has no actual spread prices, so these returns are a model built on -110 everywhere. Real prices move around that figure, and shopping for a better number would change every bar on this chart.
Underdog cover rate drifting season to season since the bubble
The season view shows the underdog cover rate rising from 48.6% in 2020-21 to 50.4% in 2025-26. Read quickly, that looks like a market slowly growing too generous to favourites. But underdogs covered more than half of non-push games in just 1 of the 6 full seasons.
View the data: underdog cover rate by season
| Underdog covered | |
|---|---|
| 2020-21 | 48.6% |
| 2021-22 | 48.9% |
| 2022-23 | 49.7% |
| 2023-24 | 49.7% |
| 2024-25 | 49.9% |
| 2025-26 | 50.4% |
A single season gives a much smaller sample than the full set, so its margin of error is wider than the ยฑ1.1 points on the overall figure. I would not call this a trend. The rise is gentle, and the line never moves far from even.
What I take from this
- No blanket edge exists. Underdogs covered 49.6% and favourites covered roughly the other half. Neither side comes near the 52.4% that -110 requires.
- Band splits are mostly noise. Home and road favourites swap places from one spread band to the next. Without a matchup reason behind it, I treat those gaps as sampling scatter.
- Price beats direction. Every return here assumes -110. A better number moves the result more than any choice between favourite and underdog.
Questions from readers
How often do NBA underdogs cover the spread?
Across 7,918 games with a closing spread, underdogs covered 49.6% of non-push games. That is short of the 52.4% needed to break even at -110.
Is it profitable to bet every NBA favourite against the spread?
No. At a flat -110, backing every favourite returned โ3.7%. Only favourites of -13 or more finished slightly positive, at 0.5%, and that band covers just 595 games.
Do home favourites cover more often than road favourites in the NBA?
Not on the full sample. Home favourites covered 50.3% of non-push games and road favourites 50.6%, so home court is largely priced into the closing spread.
I'm Khalid Mansour, based in Doha, and I run the NBA picks and parlays at htftpredictions.com โ leaning on pace, matchups and efficiency over gut calls.
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