Warrington are warming up nicely for a tilt at reigning Super League champions Wigan.
The Wolves, Grand Final runners-up for the last two years, remain on course for a third successive trip to Old Trafford after gaining a hard-fought 30-14 win at Castleford in the first preliminary semi-final.
The line-up for the last four will be completed on Friday night when Huddersfield host Catalan Dragons, after which table-toppers St Helens will select their semi-final opponents under the controversial ClubCall system so despised by Warrington boss Tony Smith.
Saints look certain to avoid Warrington, who finished fifth this year but have beaten their derby rivals on all their previous trips to Langtree Park, and instead pick the winners of the second preliminary semi-final at the John Smith's Stadium.
Smith, who was fined for snubbing ClubCall last year when his club opted to play Huddersfield in the last four, is relieved not to be placed in the same position this time.
"Everybody knows I love ClubCall," he said, tongue in cheek.
"Whether we're picked or whether we're pushed, we don't really care. Obviously we're just happy to be through to the next round, understanding that both teams that are options for us are going to be tough.
"We've had to do it from sudden-death in week one but after week one it's the same for everybody.
"We've had a pretty good five or six weeks. We've been building it up. Our intensity has increased as the season has gone on and hopefully we can keep building it. Who knows how far it can take us?"
Warrington, who lost to Wigan in last year's Grand Final, were in control of their clash with the Tigers from the moment centre Ryan Atkins followed up a charge-down to open the scoring with a fourth-minute try.
Winger Joel Monaghan scored twice, taking his try tally for the season to a remarkable 37, and impressive full-back Stefan Ratchford created second-half scores for Gareth O'Brien and Rhys Evans as the Wolves cruised to victory over a tired-looking Castleford.
St Helens rugby league are celebrating their first trophy in six years.
After their nearest rivals Castleford lost to Catalan Dragons, they finished top of Super League to win the League Leaders Shield.
The honours keep coming, with winger Tommy Makinson today named in the Super League dream team.
Our Sports Correspondent David Chisnall has been speaking to a couple of Saints who feel blessed.
If St Helens avoid defeat at Huddersfield tonight they'll lift the Super League Leaders' Shield. Head Coach Nathan Brown says the fans are ready to taste success again.
Nathan Brown, Tony Smith, Lance Hohaia and Simon Grix look ahead to tonight's Super League clash between St Helens and Warrington at Langtree Park. If Saints avoid defeat they will clinch the Super League Leaders' Shield.
St Helens star Jonny Lomax's season is over after he suffered a serious injury in last weekend's game against the Catalans Dragons.
The 23-year-old damaged his knee in the second half and needs an operation.
Saints Head Coach Nathan Brown said: "This is obviously a blow to the team but more importantly to Jonny. He has been in great form and has settled well into the full back position.
"He will now begin his road to recovery led by our medical staff and we wish him well.
“Jonny has a strong character and we're sure he will come back and prove once again to be a pivotal player for us."
St Helens RLFC legend Paul Wellens speaks about playing at the home of the new Premier League champions. Wellens is a life-long Manchester City supporter.
St Helens star Mark Flanagan looks ahead to Sunday's Magic Weekend showdown with Warrington Wolves.