Fellow British heavyweight Dereck Chisora has made a predictably low-key entrance...

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Ferocious from Dillian Whyte, thudding into the body of the Polish fighter. Whyte winds up a left but it's wild and he's instead just caught himself, but rides it well.

Whyte wheels Wach in like a six-foot-something yo yo to get a shot to the ribs away and then wriggles in a right-hander over the top of the 39-year-old's guard.

Two down...

Luke Reddy
BBC Sport in Riyadh

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If you wondered how big an event this was and how big the organisers have gone, take a look at the size of the media centre.

It’s bigger than any I’ve seen at the Olympics.

Right now it’s being used as a shelter. The charm offensive by organisers has been obvious and they can’t do enough to help those here. Well, they could stop the rain but so far it’s been beyond them.

Wach is the taller fight, boasting the reach on Whyte - the British fighter patrols the ring, keeping his distance before landing a right to the lower body of his opponent and looking to close the gap. Another low right hand slips through, then a hooked left. Good start.

Right, there's the bell...

The first of a potential 10 rounds gets under way.

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Dillian Whyte might be on the undercard here, but make no mistake he's got eyes on the prizes currently sitting in Andy Ruiz Jr's corner.

The only loss on the Londoner's professional record came against the man topping the bill, Anthony Joshua, and Whyte has been working his way through the heavyweight division since.

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What do you know about Mariusz Wach? Well, most notably he challenged Wladimir Klitschko for the unified heavyweight titles in 2012, lost by decision and then admitted to doping. The 39-year-old heads into this bout on the back of three straight losses.

Image source, Reuters

Update, it's still raining...

Dillian Whyte, the Body Snatcher, is already entertaining the fans on his route to the ring - black robe with gold trim, hood up, head bowed, arms dangling... before howling in the air as he approaches the ropes.

Now he's having his trainers unwrapped...

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Dillian Whyte's charge for a doping violation was dropped on Friday.

The 31-year-old provided a sample on 20 June this year - before his victory against Oscar Rivas in July - that contained traces of a banned steroid.

But UK Anti-Doping says the levels in his sample were "very low" and the presence of a steroid was "not caused by any fault, negligence or wrongdoing" on Whyte's part.

In a joint statement released on Friday following an investigation, Ukad said Whyte's positive test could not have affected his bout against Rivas.

Whyte survived a ninth-round knockdown to beat the Colombian on points at London's O2 Arena in the summer.

Image source, Getty Images

And we are going to bring you Dillian Whyte against Mariusz Wach as one to whet the appetite before tonight's main course...

Diriyah Arena, Riyadh, Saudi Arabia - Ruiz v Joshua II

• Dillian Whyte v Mariusz Wach (non-title heavyweight fight)
• Alexander Povetkin v Michael Hunter (WBA world heavyweight title eliminator)
• Andy Ruiz Jr v Anthony Joshua (WBA, IBF and WBO world heavyweight titles) - ring walks expected at 20:45 GMT

Luke Reddy
BBC Sport in Riyadh

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There was plenty of talk about fans being done out of seeing this fight and yes, ideally, many would probably have liked it at the O2, Wembley, or better still on their front lawn.

The visas and tickets necessary to get in were not overly arduous to obtain fans tell me. There’s a decent handful of Brits in town and a few Mexicans like these guys in from Mexico City.

They’ve become a bit of a magnet for TV crews, including ESPN in this instance.

BBC Radio 5 Live

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That's Anthony Joshua, tuning into Bunce and Costello during the weigh-in...

You can listen to the latest 5 Live podcast - packed with plenty of pre-fight predictions - right here.

Andy Ruiz Jr, the world heavyweight champion, is in the building. But we're hearing Anthony Joshua's car has got a little lost... a nice scenic diversion through the desert.

We want you to hit us with your predictions quicker than an Andy Ruiz body combo...

Can Anthony Joshua reclaim his world heavyweight titles? Will Ruiz Jr shock the Briton once more?

Let us know using #bbcboxing

Hope Luke's not been rifling through the cupboards looking for his Christmas presents, again...

We will, of course, keep you right up to date with what is happening with the weather.

Luke Reddy
BBC Sport in Riyadh

I’m told it rains 17 days a year in Riyadh. Nailed it down for three hours so far.

An open-air arena remember. It’ll all be fine.

There was a brief whisper of what it would take in terms of weather to see this thing called off.

You may recall the Rumble in the Jungle was called off because of an injury and pretty much everyone stayed put for weeks until they rumbled.

None of that please. I’ve got some good Christmas gifts waiting at home this year.

Image source, Reuters

Image source, Reuters

Yes, that is rain in Saudi Arabia...

The temporary Riyadh venue wasn't particularly built for wet weather, but luckily someone has packed some plastic macs.