82-0 vs. 162-0: Why an NBA Perfect Season and an MLB Perfect Season Aren't Comparable

“82-0,” “162-0,” and “17-0” all use the same dare — draft a roster, go undefeated — but they are not remotely equivalent challenges, because their season lengths aren’t remotely equivalent.

The raw math: more games means a harder target

Every additional game in a schedule is another independent chance for a loss to end a perfect run. That’s why, even for a team that’s a heavy favorite in nearly every individual game, the odds of clearing a 162-game schedule undefeated are dramatically lower than clearing an 82-game one, which is itself dramatically lower than a 17-game one. Our companion piece on the real odds of going 82-0 walks through the compounding math in more detail — the same logic applies at every schedule length, just scaled to how many games are actually being played.

162-0: baseball’s much longer bar

162-0.net runs the MLB equivalent of this genre, built around a full 162-game regular season — the longest schedule of any major U.S. professional sports league by a wide margin. No MLB team has ever finished a season undefeated, and even baseball’s best-ever full-season records sit dozens of games short of perfect. A 162-game perfect season is a categorically harder target than an 82-game one, not just a modestly harder one.

17-0: football’s much shorter bar

On the opposite end, a modern NFL regular season is only 17 games — our sibling site 17-0.team runs that version of the same core idea. Seventeen consecutive wins is a dramatically smaller number to sustain than 82 or 162. That said, raw game count isn’t the only variable: NFL teams play just once a week, so a full season unfolds over roughly four months with much less cumulative physical wear per game than basketball’s near-daily NBA slate or baseball’s every-day MLB stretch. Comparing difficulty purely by game count understates how much a single NFL loss matters relative to a single NBA or MLB one.

Why the schedules are this different at all

It comes down to what each sport’s players can physically sustain. Baseball’s comparatively lower per-game injury risk and pitching-rotation structure support playing nearly every day for six months. Basketball settled at 82 games after decades of the NBA experimenting with shorter schedules in its earliest seasons — see our guide on teams that almost went undefeated for how that number grew over time. Football’s extreme physical toll on players caps a season at roughly one game a week, which is why 17 games (plus a bye week) is the modern standard.

What this means if you’re chasing a flawless run

If going undefeated is specifically what you’re after, the schedule length you’re playing under matters as much as the roster you draft. This site’s own game already accounts for that on the NBA side: since the simulated schedule is era-accurate, an earlier-era run (as short as 48 games in the league’s first several seasons) is a mathematically easier flawless target than a full 82-game modern-era run — the same logic that makes 17-0 an easier bar than 162-0 across sports.

Try the NBA version — or the NFL one

82-0 simulates an era-accurate NBA schedule, from 48 games in the league’s earliest seasons up to a full modern 82. If football’s shorter bar interests you more, our sibling site 17-0.team runs the same premise for the NFL. Both are free, with no account required.