If you have played Fantasy Premier League for a while, you will have heard people talk about "differentials". These are players very few managers own. Picking the right one at the right time is one of the best ways to climb your mini-league. Picking the wrong one, at the wrong time, can leave you watching your rank slide. This guide explains what differentials are, when they are worth the risk, and how to find good ones.
What ownership actually means
Every player in FPL has an ownership figure: the percentage of all managers who have him in their squad. A player owned by 50% of managers is in half of all teams. A player owned by 3% is in very few.
Ownership matters because FPL is a competition against other managers, not just a points total. When a highly owned player scores, most of your rivals gain the same points you do. Your rank barely moves. When a player very few people own scores, you gain points that almost nobody else gets. That is what moves you up the table.
There is no official cut-off, but many managers think of anyone under about 10% ownership as a differential, and anyone under 5% as a true punt.
Effective ownership
Ownership tells you who has a player. Effective ownership (EO) also counts who has captained him. If a player is owned by 60% of managers and half of them captain him, his EO is well above 60%, because each captaincy counts double.
Here is a simple worked example. Say a striker has an EO of 150 among the managers you are competing with. If you own him but do not captain him, and he scores 10 points, you gain 10 while the average rival gains 15. You actually lose ground. If you do not own him at all, you fall even further behind. High EO players are often "shields": you own them to avoid falling behind, not to get ahead.
A differential works the other way. If a midfielder has an EO of 3 and scores 10, you gain about 10 points on almost everyone around you.
When should you take a risk?
Differentials are not always the right call. How much risk to take depends on where you are.
You are well behind in your league. Playing it safe will not close the gap, because you will mostly score what your rivals score. This is the time to back a few low owned players and accept some bad weeks.
You are leading or close to the top. Copying the popular picks protects your position. If everyone scores the same, you stay ahead. One or two differentials can still help, but there is less need to gamble.
It is early in the season. There is plenty of time to recover from a bad pick, so a bit of risk costs less.
It is late in the season. Every point matters more, and your league position tells you clearly whether you need to chase or defend.
A sensible rule for most managers is to keep your core of reliable, popular players and use one or two spots for differentials, rather than filling your team with them.
How to find a good differential
A low ownership figure on its own is not a reason to buy someone. Many players are low owned because they are not very good for FPL. You want players who are low owned for reasons that do not affect their points.
Look at underlying numbers, not just points
A player can be unlucky for a few weeks. Expected goals (xG) and expected assists (xA) measure the quality of the chances a player gets and creates. If a midfielder is getting into good shooting positions every week but has not scored yet, he may be due a return, and his ownership may still be low because his points look modest. Combining these into expected goal involvement per 90 minutes (often written xGI90) is a quick way to compare players.
Check the fixtures
A differential with three or four kind fixtures in a row is far more useful than one facing the top sides. Look a few gameweeks ahead using the fixture difficulty rating, and try to buy just before the good run starts.
Make sure he plays
Minutes are everything. A low owned player who gets subbed off at 60 minutes or rotated out each midweek will struggle to score. Look at recent minutes, team news and how settled the manager's line up looks.
Set pieces are a bonus
A player on penalties, corners or direct free kicks has extra routes to points that rivals may overlook. This is especially valuable in a cheaper midfielder or defender.
Common mistakes
Buying a differential just to be different. If there is no good reason to expect points, it is simply a weak pick.
Holding on too long. If the fixtures turn or the minutes dry up, move on. A differential is often a short term pick.
Ignoring the template completely. If a hugely popular player is in great form, not owning him is itself a big risk. Sometimes the bravest move is the obvious one.
Taking too many hits. Spending four points on a transfer for a low owned player only works if he scores well. Plan transfers a week or two ahead where you can.
Putting it together
A good differential ticks several boxes at once: low ownership, strong underlying numbers, a run of kind fixtures and secure minutes. Use your league position to decide how many to own, keep a steady core around them, and be willing to move on when the reasons for buying have gone.
Each week, the Lab's FPL picks post includes a differential chosen from our live data, which is a handy starting point for your own research.