NBA DFS Post-Contest Simulator: Grade Your Lineups
July 19, 2026
NBA DFS Post-Contest Simulator: How To Grade Your Lineups And Win
The NBA DFS Post-Contest Simulator is the tool that separates players who improve from players who just keep firing lineups. Most people do the same thing when a slate ends: they check the profit-loss number, feel good or bad about it, and move on to tomorrow. That is the fastest way to stay exactly as good as you are right now. Winning at NBA DFS over a full season is not only about playing the slate. It is about analyzing every lineup you entered against the field's lineups afterward, so you can see where you nailed it and where you leaked money. This is how to run that review with the Stokastic tool built for it.
In Summary
- The Post-Contest Simulator Is A Review Tool, Not A Build Tool. After a contest ends, it re-simulates every lineup in the field tens of thousands of times so you can grade your own entries against everyone else's, instead of only reading last night's cash number.
- Sim ROI Is The Honest Verdict. Actual ROI tells you what happened on one night. Sim ROI tells you how good the process was across thousands of outcomes, and that is the number you want trending up.
- Set It Up Like A Contest Lookup: sport, site, date, slate, and the specific contest, then your username (and optionally an opponent's) to pull your exact lineups.
- The Player And Lineup Views Find Your Leaks. They show which players you were over- or under-exposed to versus the field, which of your lineups were too chalky and got over-duped, and which builds quietly graded out as the best in the contest.
- Study The Winners. Pull the whole field, sort by Sim ROI, and reverse-engineer the exposures and construction that keep certain players and content creators at the top of the standings.
Watch: How To Use The NBA DFS Post-Contest Simulator
Here is the full walkthrough this article is built from, run on a real NBA slate. Watch on YouTube.
Why Post-Contest Analysis Is The Step Most Players Skip
A winning NBA DFS process has two halves, and most players only do the first one. The front half is building good lineups, which is what the NBA DFS Sims and the Single Lineup Simulator handle before lock. The back half is the review: taking a completed slate apart to learn what actually worked, so the next night's builds are sharper.
That review is exactly where the Post-Contest Simulator lives. It takes a contest that has already been decided and re-simulates every lineup in it tens of thousands of times, using the same simulation engine that grades lineups before lock. The point is not the single result that happened, because one slate is mostly noise. What matters is the expected value of the lineups you and the field played, so you can tell a good process apart from a lucky (or unlucky) night. If you are still fuzzy on why simulated results beat a single-point projection, our Sims vs optimizers breakdown covers the logic.
Close the loop on your NBA process. The Post-Contest Simulator ships inside the Stokastic NBA package alongside the NBA Sims, projections, and ownership. New here? Code POSTSIM10 takes 10% off your first month so you can grade every slate against the field: Start with Stokastic NBA.
Pull Up The Contest You Want To Analyze
The setup mirrors looking up any contest. Get these four things right at the top of the screen before you run anything:
- Sport And Site. Confirm NBA and the correct site (DraftKings or FanDuel) for the contest you are reviewing.
- Date And Slate. Pick the date, then the slate: early, main, or a showdown slate, so you are looking at the right pool.
- Contest. Most of the day's main contests load in the dropdown. Select the exact one you want to break down.
- Username. Type in your own username to pull your lineups. You can also leave it blank to study a contest you did not even play, or add a second username to compare your lineups head-to-head against an opponent, exposures and builds included.
Once everything is set, press view contest simulation.
Read Your Contest-Level Numbers First
The opening screen shows every player who was in the field and a row of summary numbers for your entries. Here is what those numbers looked like for the entrant in the walkthrough:
| Metric | Walkthrough value | What it tells you |
|---|---|---|
| Lineups Played | 150 | Your entry volume for the contest |
| Duplicates Per Lineup | ~2 | How often the field landed on your exact builds |
| Sim ROI | 17.7% | Expected ROI of your lineups across thousands of sims |
| Actual Lineup ROI | 576.4% | What the lineups actually returned on the night |
| Average Ownership Sum | average across your lineups | Combined ownership packed into a typical lineup |
Ownership sum is the number to sit with. It measures how much combined ownership you stacked into a typical lineup, and it is the quickest tell for whether you were playing chalk or leverage. From here, compare yourself to the whole field. You can sort to see who posted the highest Sim ROI on the slate, and you can filter to your own volume tier. Turn on a filter for total lineups equal to 150 and you are only measured against other 150-max players who faced the exact same decision you did.
That comparison is where the reality checks live. Some 150-maxers will sit ahead of your Sim ROI and some will sit well behind it. One entrant in the walkthrough showed a negative 100% Sim ROI and a negative 100% actual ROI: 150 dead lineups, almost certainly dummy entries someone forgot to update before lock. Seeing exactly where you rank among players who committed the same number of entries is far more useful than staring at your own profit-loss in isolation.
Use The Player ROI View To Find Your Exposure Leaks
Click your name and open the player ROI view. For every player on the slate you get three numbers that are best read together:
| Column | What it measures |
|---|---|
| Field Ownership | How much of the field rostered that player |
| Sim Player ROI | Expected ROI of that player across tens of thousands of sims of every field lineup that used him |
| Actual Player ROI | How profitable that player actually was in the real results |
Reading those three side by side is what surfaces a leak. In the walkthrough, lineups with Luka Dončić posted a 315.8% Sim player ROI on that slate, an elite play by the sims. Yet the entrant's own lineups with Luka returned just 13.6% ROI, on 20% Luka ownership against the field's 14.5%. So he was correctly overweight a great play, but his specific builds around that player still left money on the table. Right player, wrong construction, is exactly the kind of leak this view exposes. Pair it with our ownership and leverage guide to turn those reads into next-slate adjustments.
Use The Lineup ROI View To Diagnose Bad Builds
Switch to the lineup ROI view and you can rank your own lineups by Sim ROI and by actual ROI. Every lineup carries its full metrics: projected fantasy points, actual fantasy points, ownership sum, finishing place, and how many times it was duplicated.
This is where variance gets honest. The lineup that actually won the GPP in the walkthrough carried only a 5.3% Sim ROI, a modest projected build that happened to spike. Meanwhile the entrant's best Sim ROI lineup graded out as the third-best lineup in the entire contest, and he also owned the fifth-best expected lineup in the field. The lesson is not to chase the one that won. Keep building lineups like the ones that projected best, because those are the builds that win over a season.
The most actionable habit here is filtering by duplicates. Sort to see which of your lineups got duped the most, then ask why. Were they too chalky? Did you leave in a combination the whole field also landed on? Is that a build you should be filtering out in the pre-contest sims before you ever enter it? Every over-duped lineup you catch becomes a rule you can add to tomorrow's build.
Study The Whole Field And The Players Who Win
Now select the entire field. You can see the sims for every lineup that was entered and sort to find which builds were expected to have the highest ROI, regardless of how the night broke. When the entrant in the walkthrough sorted the full field, one lineup from an entrant named Bat Stunner showed a 143.9% Sim ROI.
Do not stop at your own account. Look up the lineups of players you like to watch on content, plus the names you regularly see near the top of the standings, and study what they are doing: which players they attack, how much ownership they absorb, how they build around a core. Reverse-engineering how the players who consistently finish near the top construct their lineups, night after night, is one of the fastest ways to improve, and almost nobody bothers to do it.
Feed What You Learn Back Into Your Builds
The Post-Contest Simulator only pays off if the review changes what you do next. The loop is simple. Grade the slate here, find the one or two leaks (an over-duped chalk build, a player you were badly under-owned on, a construction that undersold a great play), and carry that fix into the NBA DFS Sims for the next slate. Do that consistently and you are not just playing NBA DFS. You are compounding, getting a little sharper every night the rest of the field stands still. Newer to the fundamentals underneath all of this? Start with the DFS beginner guide and the NBA DFS strategy guide.
Frequently Asked Questions
What is the NBA DFS Post-Contest Simulator? It is a Stokastic tool that, after an NBA contest ends, re-simulates every lineup in the field tens of thousands of times so you can grade your own entries against everyone else's on Sim ROI, ownership, and duplicates. It turns a finished slate into a review that makes your next builds better.
What is the difference between Sim ROI and actual ROI? Actual ROI is what your lineup returned in the one contest that happened. Sim ROI is the expected ROI of that lineup across thousands of simulated outcomes, so it measures how good the process was rather than how one night broke. A lineup can win a GPP on a low Sim ROI or lose with a great Sim ROI, both of which are variance. Over a season, you want to be on the high-Sim-ROI builds.
How do I compare myself to other players? Enter your username to pull your lineups, then sort the field by Sim ROI and filter to your own entry volume, for example only other 150-max players. You can also type in a specific opponent's username to compare exposures and builds head-to-head.
Why should I care which of my lineups got duplicated? Heavily duplicated lineups are usually too chalky, which caps their upside in large-field tournaments. The lineup ROI view shows your dupe counts so you can spot over-duped builds and filter those combinations out in the pre-contest sims before you enter them again.
Which Stokastic package includes the Post-Contest Simulator? It comes with the Stokastic NBA package, alongside the NBA Sims, projections, ownership projections, and the Single Lineup Simulator.
Turn Every Slate Into A Better One
The players who climb in NBA DFS are not the ones who play the most lineups. They are the ones who learn the most from each slate. The Post-Contest Simulator is how you do that: grade your lineups against the field on Sim ROI, find the leaks in your exposure and construction, study the builds that keep winning, and carry every lesson into tomorrow. Playing the slate is half the job. This is the other half.
Ready to close the loop on your NBA process? The Post-Contest Simulator comes with every Stokastic NBA package, next to the NBA Sims, projections, and ownership. Code POSTSIM10 takes 10% off your first month: Get Stokastic NBA. You can also try the free DFS Sims first.