This Sky Sports Fantasy Football Tips post by Oli Poole looks at differentials - all under 10% owned. 
The Sky Fantasy Football overhaul window opens on Sunday, giving managers a final chance to perform major surgery on their sides.
We have put together a shortlist of differential options - could one or more of them give your team the edge in the final stages of this season?

Danny Ings (£9m) - 6.8%/3.6% of top 1k

Classing the likes of Mane and Sterling as forwards instead of midfielders has created huge competition in this category. It can be difficult for managers to include a relative minnow in their teams when presented with an embarrassment of big guns. But outscoring the likes of Mane, Sterling and Salah this season is Southampton's Danny Ings. With 14 goals, he's behind only Aguero (16) and Vardy (17) in the goalscoring charts. He is level with Aubameyang and Rashford, all highly owned strikers. The fixtures look promising, too, with an enticing run of games from the start of the post-overhaul period. Ings could repay owners handsomely, at the fraction of the cost of the premium picks.

Raul Jimenez (10.6m) - 6%/2.4% of top 1k

With a leading eight MOTM awards and priced under £6.9m, Traore is likely to be the go-to Wolves pick in many an overhaul team. But having quietly accumulated 24 more points than the stocky Spaniard, the Mexican striker Raul Jimenez is under-appreciated. Before the Liverpool v West Ham game, Jimenez was level on points with Salah, making him the joint fifth highest-scoring striker in the game, and among the top ten in all positions. Eleven goals and six assists make him both a goalscorer and a provider, and he offers not only an alternative to Traore but an alternative captain to the likes of Vardy in GW28's Valentine's Day fixture. Could he break the hearts of Foxes favourites?

Ayoze Perez (£9.2m) - 1.26%/0.2% of top 1k

A popular FPL pick at the start of the season, Ayoze Perez failed to live up to expectations. While outclassed by fellow forward Vardy, the Spaniard has been in fine form in recent weeks, with three goals and three assists in his last five, plus two tier-two shots bonuses, a tackle bonus and a MOTM award. The majority of teams will plump for Vardy as their Leicester attacking cover. Perez represents a do-or-die roll of the dice differential for those with nothing to lose.
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