How To Use The MLB Single Lineup Simulator (Stokastic)

If you would rather hand-build your own MLB DFS lineups than fire off a giant pool of computer-generated ones, the MLB Single Lineup Simulator is the Stokastic tool built for you. It solves the moment every hand-builder knows: you finish a lineup you like, then have no real idea whether it is a live contender or quietly dead on arrival. Here you build the lineup yourself, simulate it against the projected field, and get a clear read on whether it is strong or a rebuild. It returned for the baseball season with new features on top of last year's version, and this is how I use it on a DraftKings or FanDuel slate.

In Summary

• The Single Lineup Simulator Is For Hand-Builders And Cash-Game Players, not for spinning up hundreds of lineups at once. You build one, sim it, adjust it, and re-sim until it is the lineup you want to enter.
• "Complete This Lineup" Is The New Shortcut. Lock in the players you love, press the button, and it fills the rest with the highest-projected build around your core. It is the fastest way to a cash-game lineup on the board.
• Sim ROI Is The Headline Read. Set your contest type and percentage to first, run the sim, and see whether the build is playable or a rebuild before you enter it.
• Stacking Is One Click. Click a single game to filter the board to just that matchup, seed the bats you want, and complete the lineup around them.
• Save, Name, And Export every lineup, then push them straight to DraftKings, FanDuel, Yahoo, or OwnersBox.

Watch: How To Use The MLB Single Lineup Simulator

Here is the full walkthrough this article is built from, demonstrating the tool and its new features on an opening-day MLB slate. Watch on YouTube.

What The Single Lineup Simulator Does (And Who It's For)

There are two ways to attack MLB DFS inside Stokastic. The MLB Contest Sims build a whole pool of lineups and shape your exposures across all of them, which is the mass multi-entry workflow. The Single Lineup Simulator is the other side of the coin: it serves the player who enjoys hand-building one lineup at a time and wants real feedback on it before locking.

The idea is simple. You build a lineup on the site, the tool simulates it against the projected field the same way the Contest Sims do, and it tells you whether that lineup is expected to be any good. You tinker, re-simulate, and keep going until you have the build you trust. It is a natural fit for cash games, for single-entry play, and for the tournament player who is more of a hand-builder than someone entering 20 or 150 lineups a night.

	Single Lineup Simulator	Contest Sims
Best For	Hand-builders, cash games, single entry	Mass multi-entry, building a full pool
You Build	One lineup at a time	Hundreds of lineups at once
The Feedback	Sim ROI on your exact lineup	Sim ROI ranking across the whole pool
The Shortcut	"Complete this lineup" finishes your core	Full pool generation and exposures

To follow along, pull up the day's board in the MLB DataHub, where the player projections and ownership projections that feed the simulator live.

Build by ROI, not a hunch. The Single Lineup Simulator sits inside the Stokastic MLB package alongside the MLB Sims, projections, and ownership. New here? Code MLBSIMS10 takes 10% off your first month so you can hand-build a lineup and read its Sim ROI before you lock: Start with Stokastic MLB.

The Fastest Cash-Game Lineup: "Complete This Lineup"

The biggest upgrade this season is a genuinely easy way to have a lineup optimized for you. With the day's slate on screen, every player projection and ownership projection is already loaded. If you just want the highest-projected cash-game lineup you can build off those projections, press complete this lineup. The tool fills out the rest of the lineup with the build that projects for the most fantasy points. That is your baseline cash lineup in one click.

From there you steer it. Say you are set on one player who did not show up in that top-projected build. In the walkthrough, Paul Skenes was not in the optimal lineup, so you drop him in, press complete this lineup again, and the tool fills the remaining spots with the best projected players around him. You can lock in as many players as you want and let it optimize the rest, which makes it just as useful for the hand-builder who wants a few specific players as it is for the pure cash player who wants the chalk-optimal build.

Build A Stack In One Click

Stacking is where MLB DFS is won, and the simulator makes it painless. Click an individual game and the board filters to only the players in that matchup. Want a Red Sox stack? Click the Boston game, seed four Red Sox bats, and press complete this lineup. You get the highest-projected build wrapped around those four players, with the rest of the roster filled in for you.

It works for any team the same way. In the demo, a five-player Cleveland Guardians stack came together fast: Jose Ramirez, Steven Kwan, Lane Thomas, Carlos Santana, and Jhonkensy Noel, with the Boston game unselected so only Cleveland bats were in play, then complete this lineup to finish the roster. Seed the core, let the tool build around it, and you have a stacked lineup ready to simulate.

Run The Simulation And Read Your Sim ROI

Once the lineup is finished, you use the simulation side of the tool. Pick the kind of contest you are playing, small field or large field, then set the percentage to first, which is the share of the prize pool that pays out to first place. On the opening-day DraftKings slate shown, the contest had a $500,000 prize pool paying $100,000 to first, so that is 20 percent, and you select 20 percent. Then press run lineup simulation.

The tool simulates your exact lineup against the projected field, the same engine that powers the Contest Sims, and grades it. The headline number is Sim ROI. That five-player Guardians stack came back at a 149.7 percent simulated ROI. It was a fast, lightly-researched build in the demo, which is exactly the point: even a quick stack gets a real read, and a strongly positive number like that says the lineup holds up against the field. A negative one says go back to the drawing board.

To show the other end, the walkthrough intentionally built a bad lineup: players selected at random across every game with no correlation, plus a cheap pitcher that left a pile of salary on the table. It came back at negative 44.1 percent Sim ROI. That is the signal to tear it down and rebuild rather than enter it.

Sim Output	What it tells you
Sim ROI	The headline verdict: strongly positive is a contender, negative is a rebuild
Win %	How often the lineup finished first across the simulated contests
Top-10 %	How often the lineup landed in the top 10
Cash %	How often the lineup cashed at all, first place included

On that deliberately bad build, the supporting numbers matched the verdict: a 21 percent cash rate and poor win and top-10 figures, all consistent with a negative-44.1-percent lineup you should not be playing.

Tune The Projections Yourself

If you disagree with a projection, you are not stuck with it. Click any player and edit their number by hand. In the walkthrough, Paul Skenes was projected for 19.6 fantasy points; if you think he deserves more, type in 22, or use the plus and minus arrows to nudge the projection up or down, or roll it back to the original number. From then on, whenever you optimize or simulate a lineup with that player in it, the tool uses your projection instead. It is a quick way to bake your own read into both the optimizer and the sim.

Save, Name, And Export Your Lineups

Build and save as many lineups as you want, and give each one a name. Your saved builds sit in a list you can return to, add to, or delete from. If you play a handful of lineups a night, this is where you keep them straight: hand-build three or four, save them with clear labels, and enter them when you are ready.

When it is time to play, you have two paths. You can hand-enter the saved lineups into DraftKings, FanDuel, or wherever you play, or you can export them straight from the page and upload them directly to the site. The Single Lineup Simulator supports DraftKings, FanDuel, Yahoo, and OwnersBox, so your builds go from the tool to the contest without rebuilding them by hand.

How To Use The Outputs Across Cash And Tournaments

One note on how to lean on the numbers. This tool is built for cash-game players, single-entry players, and hand-builders who play a few large-field tournaments rather than mass-entering 20 or 150 lineups a night. The "complete this lineup" optimizer gets you to the highest-projected build fast, which is a strong starting point for cash games like double-ups and 50/50s. The simulation layer then reads that build against the field, and the percentage-to-first setting tailors the read to the exact contest you are entering, whether that is a small-field or large-field event. The workflow is the same either way: build it, sim it, and let the Sim ROI tell you whether it is worth entering. Newer to contest types? Our guide to the MLB DFS Sims covers how the simulations think about the field.

Frequently Asked Questions

What is the Stokastic MLB Single Lineup Simulator? It is a Stokastic tool that lets you hand-build one MLB DFS lineup, then simulate it against the projected field to see whether it is strong or a rebuild, measured by Sim ROI. It supports DraftKings, FanDuel, Yahoo, and OwnersBox.

What is a good Sim ROI for an MLB DFS lineup? A strongly positive Sim ROI means your build holds up against the field, and higher is better. In the demo, a five-player Guardians stack simulated at 149.7 percent, while a deliberately bad, uncorrelated lineup came back at negative 44.1 percent. A negative number is your signal to rebuild rather than enter it.

Do I have to build the whole lineup myself? No. Lock in the players you want, then press "complete this lineup" and the tool fills the rest around them with the highest-projected build. You can seed one player, a full four- or five-man stack, or none at all for the pure chalk-optimal cash lineup.

Can I change the player projections? Yes. Click any player and edit their projection by hand, use the plus and minus arrows, or roll it back to the original. The optimizer and the simulator both use your edited number from then on.

Which Stokastic package includes the Single Lineup Simulator? The Single Lineup Simulator is part of the Stokastic MLB package, alongside the MLB Sims, projections, and ownership projections we build every day. Check the pricing page for current package details.

Build Your Next MLB Lineup With Real Feedback

Hand-building is more fun than spinning up a giant pool, but only if you know whether your lineup can actually win. The Single Lineup Simulator gives you that answer before lock: complete a lineup off the projections or seed a stack and build around it, simulate it against the field, read the Sim ROI, and rebuild anything that comes back weak. That is the difference between hoping a lineup is good and knowing where it stands.

Ready to build by ROI? The Single Lineup Simulator is part of the Stokastic MLB package, next to the MLB Sims, projections, and ownership. Code MLBSIMS10 takes 10% off your first month: Get Stokastic MLB. You can also try the free DFS Sims first.