Round 21 is here and the top ten is starting to harden. Finals spots are in short supply, form players are peaking and the betting markets are ripe for those who know where to look.

Each week, we dig into the numbers to find the players best placed for a big performance, the ones the general market might be sleeping on and the ones we're backing with confidence.

For the inside lane on the best AFL bets, check out Kate McCarthy's list of the best AFL bets and players to watch in Round 21 below.

Best AFL Players to Add to Your Multi - Round 21

Tim Membrey - Collingwood Magpies vs Geelong Cats

Membrey has quietly become one of the most reliable goal-kicking propositions in the competition. Two or more goals in seven of his last eight games. Three or more in four of those eight. That kind of consistency doesn't happen by accident.

He's the beneficiary of a Collingwood attack that's firing right now and the MCG gives him the space to run. Geelong's contested defence has been tested hard in recent weeks and Membrey is exactly the kind of forward who punishes teams when they're focused on containing bigger threats.

With Nick Daicos demanding attention through the midfield, Membrey gets his chances.

Betting tip: Tim Membrey 2+ Goals or 3+ Goals.

Chad Warner - St Kilda vs Sydney

Warner has averaged 25.6 disposals across his last five games and been attending 68.9% of centre bounces in every single one. The common thread? Errol Gulden has been back in the lineup for all five.

When Gulden is drawing attention in the middle, Warner gets room to operate. This combination is starting to look genuinely dangerous. Warner tallied 29 disposals the last time these sides met in Round 13 and St Kilda concede enough midfield ball to make a big night here very achievable.

Betting tip: Chad Warner 26+ Disposals.

Xavier O'Halloran - Port Adelaide Power vs GWS Giants

The GWS injury toll is severe. Tom Greene, Finn Callaghan, Jesse Riccardi and Daniels are all out, a substantial chunk of the Giants' midfield depth gone in one hit. Someone has to absorb that centre bounce time and O'Halloran is putting his hand up.

His season CBA average sits at 28%. Last week? 71 per cent, with 23 disposals. That's not a coincidence. If Port Adelaide's midfield pushes his workload up again, the 23+ disposals market deserves serious attention.

Betting tip: Xavier O'Halloran 23+ Disposals.

Dustin Prestia - Richmond Tigers vs West Coast Eagles

West Coast concede disposals to opposition midfielders at the third-highest rate in the competition. Prestia, since returning from injury, has posted 25 and 24 disposals in back-to-back weeks and is clearly finding his legs again.

The matchup is about as friendly as it gets. Richmond at home against a West Coast side that bleeds midfield ball , Prestia should be busy from the first bounce and has the recent form to back him going deep.

Betting tip: Dustin Prestia 25+ Disposals.

Izak Rankine - Essendon Bombers vs Adelaide Crows

Rankine saves his best ball-winning for when the Crows are winning. His 2026 disposal average in Adelaide victories sits at 26.2. In losses, it drops to 15.7. The gap tells you everything about where his head is at.

Essendon concede disposals to opposition midfielders at the highest rate in the entire competition.

If Adelaide get on top in this one, Rankine could have a field day. Anywhere from 26 to 30+ is firmly in play.

Betting tip: Izak Rankine 26+ Disposals.