> ## Content Index > Fetch the complete content index at: https://www.office-of-second-looks.com/llms.txt > Use this file to discover other available public pages before exploring further. # The Playoffs Are Different (and the Same) - URL: https://www.office-of-second-looks.com/nba-home-court-playoffs-are-different/ - Published: 2026-08-06T19:55:31.000Z - Updated: 2026-08-17T01:04:34.000Z - Author: Justin Pietsch - Tags: NBA, #home_court, #things_we_think_we_know *Part 6 of a series on the NBA’s fading home-court advantage; start with* [*Home Court Advantage Is Fading*](https://www.office-of-second-looks.com/nba-home-court-advantage-is-fading/)*.* For most of four decades, home court did the playoffs a strange favor: it rescued the underdog. A weaker team, outmatched on paper, could host a game and win it more often than not. Which mattered more in a playoff game, the better team or the building? In a typical playoff game, the answer was the building. Then the favor ran out. The playoff decline is not about better teams winning more at home. It is about worse teams winning less: the building no longer saves the side that needs saving. That collapse is the fact this series opened with. The playoffs are not just a shrunken copy of the regular season. They reach the same decline by their own structure, their own baseline, and their own timeline. What they share is the destination. ![Playoff home win % by game within a series (G1–G7), all eras. The sawtooth tracks who hosts under the 2-2-1-1-1 format: the higher seed hosts G1, G2, G5, and G7 (around 71%), the lower seed hosts G3, G4, and G6 (around 55%), and every game clears the 50% coin flip. The pattern follows the building, not how deep the series has gone.](https://storage.ghost.io/c/9c/b3/9cb3bf7f-3bcf-4e35-9c96-c7d0cffd97dd/content/images/2026/08/home_court_series_game-b1402e654b0d.png) Playoff home win % by game within a series (G1–G7), all eras. The sawtooth tracks who hosts under the 2-2-1-1-1 format: the higher seed hosts G1, G2, G5, and G7 (around 71%), the lower seed hosts G3, G4, and G6 (around 55%), and every game clears the 50% coin flip. The pattern follows the building, not how deep the series has gone. The peak of that sawtooth is Game 5, the most home-lopsided game a series has: the host takes 74.5% of them. It is both the higher seed’s third home game and, in a series level at 2-2, often the one that breaks it, and this analysis cannot separate the building from the stakes. What it can say is that the advantage does not wear off: Game 7 is worth about as much to its host as Game 1, and the three games the lower seed hosts sit near 55% however deep into the series they fall. ## The twist: worse teams stopped winning at home Here is where the decline actually lives. In the 1980s and 1990s, the lower-seeded team, the weaker opponent, won 65% and 66% of their home playoff games. The gap was small, 5.6 points in the 1980s, and for a late-1990s stretch the lower seed won more often at home than the higher seed did. Quality barely mattered once you were in your own building; the question was not whether you would win at home, but whether you could steal one on the road. From the early 2000s onward the lower seed’s home rate dropped to 47–52%, while the higher seed’s held near 70–75% through 2022 before easing to about 65% in recent seasons. A gap that started at about 5–6 percentage points grew to 24 at its peak and still sits at 16 today. Measured against where they started, the top seeds barely moved. The weaker hosts collapsed. Home court used to compensate for being outmatched in the playoffs, and it no longer does. 📊 The G1–G7 breakdown from the chart at the top, broken out by era, one line per era. The… ![The G1–G7 breakdown from the chart at the top, broken out by era, one line per era. The flat all-eras average hides a shape that’s shifted underneath it.](https://storage.ghost.io/c/9c/b3/9cb3bf7f-3bcf-4e35-9c96-c7d0cffd97dd/content/images/2026/08/home_court_series_breakdown_era_only-884f834236e5.png) The G1–G7 breakdown from the chart at the top, broken out by era, one line per era. The flat all-eras average hides a shape that’s shifted underneath it. ## Is it just weaker seeds, or real home-court decline? A fair objection: maybe playoff home teams win less now simply because top seeds no longer outclass their opponents the way they once did. The data says no. Strip out the quality gap between the two teams and the year-by-year playoff decline doesn’t budge; none of it is explained by seeds bunching closer together. The cleanest test isolates the genuinely weaker team by regular-season quality: when the objectively weaker team hosts Games 3 and 4, it wins about half the time, when on talent alone it should lose. The building roughly cancels the talent deficit, and that lift is the thing the seed-by-seed record shows slipping away. 📊 The playoff decline is genuine home-court weakening, not weaker seeds. Left: the yearly… ![The playoff decline is genuine home-court weakening, not weaker seeds. Left: the yearly playoff decline is the same size before and after removing the regular-season quality gap between the two teams (quality explains essentially none of it). Right: home win % by who hosts, where even the objectively weaker team still wins about 51.5% of its home games (Games 3–4): a near coin flip, meaning the building roughly cancels its talent deficit.](https://storage.ghost.io/c/9c/b3/9cb3bf7f-3bcf-4e35-9c96-c7d0cffd97dd/content/images/2026/08/home_court_playoff_quality-326ea77fde41.png) The playoff decline is genuine home-court weakening, not weaker seeds. Left: the yearly playoff decline is the same size before and after removing the regular-season quality gap between the two teams (quality explains essentially none of it). Right: home win % by who hosts, where even the objectively weaker team still wins about 51.5% of its home games (Games 3–4): a near coin flip, meaning the building roughly cancels its talent deficit. ## Does the regular season show the same collapse? No, and the contrast is the point. In the playoffs the decline singled out the underdog: the weaker seed’s home edge collapsed while the top seed’s fell far less. If home teams everywhere were simply losing to stronger opponents more than they used to, the regular season should carry the same fingerprint. It doesn’t. A 2024 academic paper ran this quality-vs-home-court split for the regular season, so I ran the same one here. Take every regular-season game where the home team’s win rate the year before was at least 10 percentage points above or below its visitor’s. Quality matters here, and always has: today the stronger home team wins 70% of those games, the weaker one only 41%. But the gap between them hasn’t widened the way the playoffs’ did. It narrowed: every home team wins less than it used to, the stronger ones (82% to 70%) slipping about twice as far as the weaker ones (47% to 41%), so the split shrank from 34.9 points to 28.2\. The playoff gap ran the opposite way: under 5–6 points in the earliest eras, and for a stretch even reversed outright, before widening to 24 at its peak. (The paper that prompted this check is covered in the [Related Work](https://www.office-of-second-looks.com/nba-home-court-related-work/) companion.) ## A best-of-7 absorbs most of home court advantage A single home game and a seven-game series are very different things. To see how the per-game advantage translates into who actually wins a series, I ran a simulation: take the home win rate for one game and play out 200,000 best-of-7 series between two otherwise-equal teams, with the home-court side hosting Games 1, 2, 5, and 7\. The format flattens the advantage. In the earliest era a home team won about 65% of individual regular-season games, but that turned into only a 55% chance of winning a series. By the most recent era the per-game rate had fallen to about 56%, and the series advantage with it, to about 52%: a home-court team in a series is now barely better than a coin flip. The playoffs tell the same story a notch higher, a series advantage near 53% today, though the two are not far enough apart to separate on this many games. What the format changes is the scale, not the story: on the simulation’s own inputs, a 9.3-point drop in the regular-season per-game advantage shows up as about a 3-point drop at the series level, because a best-of-7 leaves the home-court team roughly a third of its per-game edge to begin with. That third applies to the decline as much as to the level: the per-game edge kept 37% of what it had in the 1980s, and the series-level edge kept 38% of its own. The series advantage was not sheltered from the fall; it is simply a smaller thing falling. Two cautions on the simulation. The playoff per-game rate mixes home court with seeding, since better teams host more games, so the regular-season figures are the cleaner read on the pure venue effect. And the simulation treats each game as a fresh start, unaffected by who won the ones before, so it shows how much the format dilutes an advantage rather than forecasting any real series. 📊 Two panels translating the per-game home advantage into a best-of-7 series advantage via… ![Two panels translating the per-game home advantage into a best-of-7 series advantage via simulation. Left: a single-game home win rate (x-axis) maps to a much smaller series win rate (y-axis) for the home-court team, far below the dashed 1:1 line; era dots sit on the curve and drift toward the 50% coin flip over time. Right: the simulated series-level home advantage by era for the regular season and the playoffs, both ending just above 50%, with the per-game rates shown muted above for contrast.](https://storage.ghost.io/c/9c/b3/9cb3bf7f-3bcf-4e35-9c96-c7d0cffd97dd/content/images/2026/08/home_court_series_simulation-2ffc6fc9ed5d.png) Two panels translating the per-game home advantage into a best-of-7 series advantage via simulation. Left: a single-game home win rate (x-axis) maps to a much smaller series win rate (y-axis) for the home-court team, far below the dashed 1:1 line; era dots sit on the curve and drift toward the 50% coin flip over time. Right: the simulated series-level home advantage by era for the regular season and the playoffs, both ending just above 50%, with the per-game rates shown muted above for contrast. ## Different timing, same direction The playoffs reached the same place later. The regular season’s bend is locatable, somewhere in the 1990s, while the playoff record shows no bend anyone can locate: postseason home court advantage sat near 64% from the mid-1990s through 2017 and has fallen since. Because each postseason rests on far fewer games than a full regular season, the direction of the playoff decline is clear but its exact size is not. The much-blamed 2014 playoff format change doesn’t explain it: once the long decline is allowed for, the format break adds nothing detectable, an alibi covered in full in [The Usual Suspects](https://www.office-of-second-looks.com/nba-home-court-usual-suspects/). ## Every playoff building looks alike One more playoff twist, covered in full in [The Altitude Holdouts](https://www.office-of-second-looks.com/nba-home-court-altitude-holdouts/): the real spread between franchises that shows up in the regular season vanishes in the postseason, where the handful of games each building hosts can’t separate one arena from another. Yet the common advantage every host shares runs larger in the playoffs than in the regular season. That is the playoff paradox in one line: the differences between buildings disappear, and the advantage of any building at all grows. --- Next: [The Altitude Holdouts](https://www.office-of-second-looks.com/nba-home-court-altitude-holdouts/). Two arenas never got the memo: Denver and Utah still punish visitors, and home blowouts keep getting bigger even as home wins shrink. Back to the series hub: [The Disappearing Home-Court Advantage](https://www.office-of-second-looks.com/nba-home-court-series/) *How this was made: the writing here is mostly AI/LLMs working from my analysis and direction; the numbers are all Python on public NBA data. Every claim is backed up by data. The data, analysis, and conclusions are trustworthy.* [*The full note is on the series hub*](https://www.office-of-second-looks.com/nba-home-court-series/)*.* *Data: NBA.com Stats, pulled with the open-source* [*nba\_api*](https://github.com/swar/nba%5Fapi?ref=office-of-second-looks.com) *tool; attendance records from* [*Basketball-Reference*](https://www.basketball-reference.com/?ref=office-of-second-looks.com)*.*