We could have a try here as Mark Percival goes over in the left corner. We're waiting for the video verdict.

Loose carry from Hull half-back Albert Kelly who drops the ball in the tackle. The visitors are going to need him at his best today.

Robbie Hunter-Paul
Former New Zealand international on BBC Two

Worrying signs for Hull so far. There have been three clean breaks so far for St Helens.

The visitors need to get control of the ruck.

Saints lose control of the ball on the fourth tackle to give Hull a chance to go back up the other end. Their best position so far. But it's a handover.

First touch for Saints star man Ben Barba is a painful one as he gets nailed by compatriot Albert Kelly. But Saints are back on the attack, then Hull's Jake Connor fails with a 40/20, as the ball flies straight into touch.

Image source, SWPix

Saints on the attack immediately in their first set of six. And already we have a break as Hull loose forward Dean Hadley is treated.

Danny Washbrook has replaced him at loose forward as Hadley comes off.

The two teams are out, to a great reception, the hooter goes and we're under way . . .

So, ahead of today's game, who do you think is going to go through to the semi-finals?

Will Super League leaders St Helens seal a place at the Macron or will Hull FC march on their way to a third consecutive Challenge Cup?

Also, Catalans, Leeds and Warrington fans, who would you rather face in today's semi-final draw, which is scheduled to happen straight after the final whistle?

Let us know using #bbcrl on social media.

Holders Hull's injury woes are starting to ease. They have centre Carlos Tuimavave (ankle) and playmaker Albert Kelly (hamstring) both back in the starting XIII.

Also, prop Scott Taylor has overcome a shoulder injury, while winger Bureta Faraimo returns following suspension.

Hull FC: Shaul; Faraimo, Logan, Tuimavave, Miloudi; Kelly, Connor; Green, Houghton, Taylor, Minichiello, Manu, Hadley.

Interchange: Washbrook, Fash, Paea, Matongo.

Referee: Ben Thaler (RFL)

St Helens make one change to their starting line-up as they look for a seventh successive win in all competitions.

Tommy Makinson comes in on the wing for Adam Swift, while star full-back Ben Barba, Super League's 17-try top scorer, has also overcome a knock to report fit.

St Helens: Barba, Makinson, Morgan, Percival, Grace, Lomax, Richardson, Amor, Roby, Thompson, Peyroux, Taia, Wilkin.

Interchange: Fages, McCarthy-Scarsbrook, Douglas, Knowles.

The Macron Stadium, home of Bolton Wanderers, will be the next Challenge Cup destination for the winners this afternoon.

The 28-000-capacity Horwich-based stadium, home to Bolton since they left Burnden Park in 1997, has been chosen, in another ground-breaking venture by the RFL, to stage both semi-finals back to back on Sunday 5 August.

Image source, Getty Images

The two Cup semis will be the first rugby league staged at the ground since the second of St Helens' two World Club Challenge wins over Brisbane Broncos in 2007.

They also beat Brisbane there in 2001, as well as losing 38-0 there to Sydney Roosters in 2003.

The ground, then known as the Reebok Stadium, also staged three Great Britain internationals there - two against New Zealand, one against Australia, all of them home defeats.

A reminder that not only is there live text coverage of today's game but you can watch and listen to all the action, too.

Click the play button above and you can watch television coverage or alternatively, you can listen to live radio commentary from BBC Radio Merseyside.

Or you can change the channel on your television to BBC Two and watch live coverage on there.

The choice is yours.

Who would have thought, when St Helens won the Challenge Cup for the third successive year in 2008, that they might go a whole decade without winning it again?

After comfortably beating Huddersfield 42-12 at Twickenham in 2006, they were then worthy winners again when the competition returned to the rebuilt Wembley in 2007, easily disposing of Catalans Dragons 30-8.

Image source, Rex Features

But, in the nine years since beating Hull 28-16 in 2008, the 12-times winners have not even made it to Wembley.

The last time they made the semi-finals was in 2015 when they lost 24-14 to Leeds at the Halliwell Jones Stadium, Warrington.

However, they do have, in Jon Wilkin and James Roby, two survivors of that last Wembley win, 10 years ago.

Hull FC have only won the Challenge Cup five times in the competition's 122-year history.

But that statistic has been massively improved over the past two years, with successive narrow Wembley wins over Warrington (12-10, in 2016) and Wigan, who they beat 18-14 just 10 months ago.

Image source, Rex Features

Now they are looking for a third Challenge Cup in a row. And who were the last side to achieve that feat? Why, St Helens of course, from 2006 to 2008.

And who were the side Saints beat to complete that feat in 2008? Hull. It had to be. 28-16. So there's more at stake here than meets the eye.

It's Challenge Cup quarter-final weekend. And attention turns to St Helens today as the Super League leaders play host to Cup holders Hull FC.

Catalans Dragons, Leeds and Warrington have already booked their places in the last four.

And, over the next two and a half hours or so, we will find out whether it's 12-times victors Saints or Hull, Wembley winners for the past two seasons, who join them.

Image source, Rex Features

Hull have already failed to win at the Totally Wicked Stadium once this season, when Saints won 26-12 there in early April, in Super League.

In fact, only one side have won there in 2018, reigning league champions Leeds, 28-20 back in March. And that flags up what a tall order this might be for the injury-hit Black and Whites.