The big question coming into Sunday's semi-final is whether Castleford half-back Rangi Chase will play.
He flew back to Australia earlier this week for a court case relating to an incident that happened before he joined the Tigers, back in 2008, but I believe he will play.
Chase is a world-class player and is probably the best half-back in the competition. He has a bag of tricks that he can utilise in a game but he has to remember that he does not need to use them all on Sunday - just the appropriate tricks at the appropriate time.
Leeds are strong and powerful and at the moment are doing the little things well. They are a strong running team with the likes of Danny Maguire, Rob Burrow and Danny Buderus to the fore.
However, Castleford can trouble Leeds if they get the ball. They have to make sure they defend well to keep Leeds out, and ensure they themselves get to the right part of the field to threaten.
Leeds have been defending well of late and they will restrict the Tigers' territory, so Castleford will have to be patient.
I don't think the lack of big-game experience will be a major disadvantage for Castleford - after all they have players like Ryan McGoldrick, Willie Isa and Nick Youngquest, plus Danny Orr, who will be another key stabilising factor as he has been about for a number of seasons.
Leeds have had to work hard over the last few weeks. They have twice gone to Hull and won, including in the last round, and they also won away to Salford last week - they know teams will be coming for them.
They are a lot healthier than they have been all campaign and, apart from Keith Senior, have all of their injured players back again, which is a major boost for them at this time of the season.
If Castleford play well, they can beat anyone, but they need a massive amount of luck and for everything to go right for them to defeat Leeds on Sunday.
I think the visitors will win - they have enough physical prowess to get over the line.
Brian Noble was speaking to BBC Sport's Elizabeth Hudson