Dublin v Cavan, Croke Park, 5.30pm
It's familiar territory for Cavan - underdogs again. They were underdogs against Monaghan, Down and Donegal, yet the Anglo Celt Cup is in Cavan.
They'll face their toughest task this weekend, but they are now in bonus territory.
Is an upset on the cards? I don't think so.
Cavan will bring an approach, a mindset that the Dubs haven't met this year.
No one gave them a prayer against Donegal, yet we found out in the aftermath that they fully believed they were going to win. They were hungry all over the pitch and marked out the key men. Michael Murphy was marked by James Smith, Ryan McHugh was marked out of it by Jason McLoughlin.
They were assured in everything they did. You had Gerard Smith and Ciarán Brady attacking from half-back. They are not afraid to hit the long ball.
To hurt Dublin you are going to have to be direct; you have to run at them and face them up offensively and defensively.
You have Con O'Callaghan, Ciarán Kilkenny, Brian Fenton. Paddy Small is like a wasp with a chip on his shoulder. He's flying. How do Cavan deal with these players? They have Padraig Faulkner, Killian Clarke and Luke Fortune who all have been doing well. In Conor Madden, Cavan have a decision as to whether to start him? He scored 1-02 the last day.
In the first quarter of the Ulster final, Donegal took one out of nine scoring chances. They kicked the ball away 26 times. Can you see Dublin doing that? I don't.
I love what Cavan have done, but for me it's Dublin.
Mayo v Tipperary, Croke Park, 3.30pm
This is a tougher match to call. Both teams are coming in with confidence after winning their provinces. Tipperary fully deserved it. On the biggest day they delivered, with Michael Quinlivan and Conor Sweeney superb with 12 points between them.
They got off to a good start, went five points up and the confidence grew.
They were very physical and hit everything that moved around the middle of the field. It is this area, the middle third, that will be key. Stephen O'Brien, Liam Casey and Colin O'Riordan were outstanding the last day.
For Mayo the basis of their game in this sector is Mattie Ruane, Conor Loftus, Diarmuid O'Connor and Aidan O'Shea. Mayo have to think that their intensity in this area will be like nothing that Tipperary have met this year. In Lee Keegan, Chris Barrett, Paddy Durcan and Oisin Mullen, they have the personnel to shackle Quinlivan and Sweeney. Will the other Tipp forwards stand up? That's a huge question.
Mayo have won a first Connacht title in five years, have introduced new players, their style of football is admirable, work hard and run hard.
Paddy Durcan and Eoghan McLaughlin have been outstanding. They have introduced new players up front - Ryan O'Donoghue, Tommy Conroy to play alongside Aidan O'Shea on the edge of the square. I think the Tipperary backs were brilliant against Cork but I don't think Cork asked the questions that Mayo will ask.
Look, anything is possible this year. Maybe Tipp, but it's Mayo for me.
Tomás O Sé was speaking on RTÉ's Morning Ireland.
Watch Dublin v Cavan (Saturday 5.30pm) and Mayo v Tipperary (Sunday 3.30pm) live on RTÉ2, listen to live commentary on RTÉ Radio 1 and get live blogs, reports and reaction on RTÉ Sport Online and the RTÉ News app. Highlights on The Sunday Game, 9.30pm RTÉ2