A difficult penultimate round looms for tipsters in the RAA Insurance Crows Footy Tipping competition.

Felicity McPherson remains a clear leader in our competition, three wins ahead of the next batch of tipsters with just two minor rounds to play. And Felicity sits in second spot in the national competition, just one behind the leader who has tipped 118 winners this season.

But tipping winners this week will not be easy.

The round 20 winner was Crows fan Andrew Martin, who was one of only six to pick eight winners.

He has won a $100 voucher from RAA Insurance and a football signed by Crows coach Neil Craig and captain Mark Ricciuto.

Think you know your football? It's time to get your tips in for the RAA Insurance Crows Tipping competition.

The RAA Insurance Crows Tipping competition is the most popular among the AFL clubs.

So get on-line now and post your round 21 tips.