Fetuli Talanoa looks like he's got Hull FC's second try, but it will be reviewed...

Francesca Day: "Trip to the gym to do my injury rehab then home to watch the Challenge Cup on TV. Today is a great one for the neutrals."

After a beautifully-observed minute's silence in memory of Hull FC legends Arthur Bunting and Dick Gemmell, and the victims of the London tower fire, the game gets under way.

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Castleford make two changes to the starting line-up which beat Warrington a week ago, with Jake Webster and Adam Milner in for Joel Monaghan and Grant Millington.

Forward Junior Moors, who was among the replacements against Warrington, misses out with a knee injury.

Castleford: Hardaker; Minikin, Webster, Shenton, Eden; Roberts, Gale; Lynch, McShane, Massey, Sene-Lefao, McMeeken, Milner.

Replacements: Millington, Patrick, Larroyer, Foster.

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Hull FC make three changes from the side which beat Salford eight days ago, as forwards Scott Taylor, Mark Minichiello and Danny Houghton return.

Josh Bowden, Jansin Turgut and Jordan Thompson are named among the replacements after starting against the Red Devils.

Hull FC: Shaul; Michaels, Fonua, Tuimavave, Talanoa; Kelly, Connor; Taylor, Houghton, Watts, Washbrook, Minchiello, Manu.

Replacements: Bowden, Thompson, Fash, Turgut.

If you have any thoughts on today's game or any of the other Challenge Cup quarter-finals, please do send them in.

You can get in touch by tweeting us using the hashtag #bbcrl.

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If Hull are to defend the Challenge Cup, they may never face a bigger test than the one posed by today's opponents.

Castleford are the dominant force in Super League this season, having scored 149 more points than any other side, while also maintaining the stingiest defensive record.

But head coach Daryl Powell isn't expecting an easy afternoon at the KCOM Stadium.

"We need to play well, right at the top of our game, and give ourselves a chance," he told BBC Radio Leeds.

"If we're at our best and they're at their best it'll be an outstanding game, and probably as close to a 50-50 game as you could ever call."

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Hull FC had quite the season last year, reaching the Super League semi-finals and beating Warrington to lift the Challenge Cup at Wembley.

Lee Radford's side have continued to impress this season, sitting fourth in Super League, and still on course to defend their Cup title.

"There was some unbelievable feelings with that cup run last season, memories that the majority of the squad participated in," Radford told BBC Radio Humberside

"They know the ecstasy that comes with winning that cup, and it'll mean an awful lot to them on Sunday."

If you aren't able to watch BBC Two's coverage of today's game, or just fancy a familiar voice to follow the action with, the BBC's local radio stations are on hand.

You can choose between BBC Radio Leeds and BBC Radio Humberside coverage by clicking on the links at the top of this page.

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Salford reached the Challenge Cup semi-finals for the first time since 1998 with a 30-6 victory over Wakefield on Thursday.

Tries from Ryan Lannon, Ben Murdoch-Masila, Niall Evalds, Greg Johnson and Craig Kopczak booked their place in the next round, with Liam Finn getting Wakefield's only try.

On Friday, the Red Devils were joined in the last four by Leeds, who scored 10 tries in their 58-0 demolition of Championship side Featherstone.

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I'm expecting fireworks today between Hull FC and Castleford, but they'll have to produce something truly special to better the finish we saw between Warrington and Wigan yesterday.

Wolves twice fought back from 12 and eight points behind to level, before John Bateman's try and Sam Tomkins' drop-goal looked to have sealed it for the Warriors.

Kurt Gidley's try brought the hosts back within a point, before Stefan Ratchford's missed penalty from the halfway line left them with one last chance to force extra time....

If you want to watch full highlights of that game - and I really think you do - just click here.

BBC Radio 5 live

Not only do we have BBC TV and local radio coverage for you to choose from, but BBC Radio 5 live are also in attendance at Hull.

Their commentary is just about to get under way, and you can listen in using the tabs at the top of this page.

BBC Two

If you want to watch today's game, you can do so by scrolling to the top of this page and clicking the tab to watch BBC Two coverage.

Make sure you stick around after the match is over, as we'll also bring you the draw for the semi-finals and further discussion on the Rugby League Forum.

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They do say leave the best until last...

It's the fourth Challenge Cup quarter-final, and it should be a cracker.

Defending champions Hull FC play host to Super League leaders Castleford, for a chance to join Wigan, Salford and Leeds in the final four.