Wembley is assured of what used to be called a Lancashire-Yorkshire final at the end of August, after local rivals were drawn together in the semi-finals of the Carnegie Challenge Cup.
Castleford's reward for defeating Huddersfield is a tilt at Leeds, who came back from 16-6 down at half-time to beat Hull 38-22. Jordan Turner scored twice for Hull to propel them to a handy lead but Carl Ablett's two tries were pivotal for the Rhinos, while Kevin Sinfield's seven goals made him Leeds' most successful kicker.
St Helens know they will have a tougher time against Wigan than they had in dispatching Hull KR 54-6. Leon Pryce scored his first try for a year and there were two apiece for Jon Wilkin and Tom Makinson as Saints ran riot.
Wigan were the first side into the semi-finals as they ended Warrington's two-year reign as Cup holders with a 42-22 defeat on Saturday. Wigan got away to a flyer, with a brilliant, long-range try from Sam Tomkins the highlight as they built up a 22-0 lead. But the Wolves were unwilling to give up their trophy meekly and twice got to within two points before two late tries from Josh Charnley shut the door.
The Warrington coach, Tony Smith, was left furious by a three-man tackle that inflicted serious knee damage on David Solomona. "I'm not happy," he said. "I've been warning people about these tackles for a long time. It was nasty and it caused a nasty injury."