Williams additionally got here up with a first-half drop-goal that gave Warrington their edge on the break.
Saints’ first-half factors got here from a Konrad Hurrell strive, improved by Jon Bennison, who scored the house facet’s solely factors after the break with a penalty.
It was the guests’ begin to the second interval that gained them the sport – and an opportunity of a primary return to Wembley since profitable the cup in 2019 – as Saints have been wrecked by two quick-fire tries.
The primary was a surprising one-hand end within the left nook from Ashton, one of many nice tries by any winger.
With virtually the entire of his physique the fallacious facet of the touchline, he snaked out his looping left arm but one way or the other saved management of the ball to the touch it down together with his fingertips.
Then got here Wire’s third strive from Wrench, additionally transformed by Thewlis, earlier than front-row ahead Harrison crashed over to make it secure and Matt Dufty jinked via to arrange man of the match Williams for the ultimate rating.
It was a second successive defeat for Saints, who didn’t bounce again from final week’s Tremendous League defeat by leaders Catalans Dragons and boss Paul Wellens warned that he’ll take into account making main modifications for this Friday’s conflict with managerless strugglers Hull FC.
St Helens coach Paul Wellens:
“We’re in a Problem Cup quarter-final and for a workforce that normally rises to the problem in large video games, we obtained the alternative of that.
“We did not study any classes in any respect from final week. It is extraordinarily disappointing and fairly sobering. I anticipated us to reply and we did not. We have got to do a little bit of soul-searching.
“I’ll have to take a look at what choices can be found. The onus is on the individuals with the shirts to maintain them, however they should perceive that being at this membership there’s a customary you want while you pull on the jersey.
“I need them to sting over the subsequent couple of days, and to be harm by it. If you happen to’re not harm by it, then you definitely’re on the fallacious membership.”
Warrington head coach Sam Burgess:
“That was some strive from Matty Ashton. However he practises actually laborious at that.
“It isn’t only a fluke. He was on the market on Saturday doing 50 or 60 of them. He places a mat out and practises. For any younger child watching, it simply exhibits that follow works.”
“We have been good, however we have nonetheless obtained a bit left. General, it a was an amazing workforce efficiency, however I am fairly relaxed about it. It actually counts for nothing now.
“Coming right here and profitable will not be a straightforward factor to do, however a few of the gamers are upset concerning the moments we did not take. We’re not getting carried away, we’re enjoying good in patches however we will enhance.”
St Helens: Welsby; Makinson, Hurrell, Blake, Bennison; Lomax, Dodd; Walmsley, Clark, Delaney, Sironen, Batchelor, Knowles.
Interchanges: Mata’utia, Mbye, Bell, Whitley.
Warrington: Dufty; J Thewlis, King, Wrench, Ashton; Williams, Hayes; Harrison, Walker, Philbin, Nicholson, Fitzgibbon, Crowther.
Interchanges: Bullock, Holroyd, Powell, Wooden.
Referee: Jack Smith.