A tidy start from Tanzim, with just three coming from the opening over.

He draws shots from both Gurbaz and Ibrahim Zadran, their bats thrashing fresh air as they don't pick the shape.

Frankie Mackay
Ex-New Zealand all-rounder on BBC Sounds

We've talked about this game being full of excitement and we've got it from ball one.

A bit of yes, no, maybe with the running, the direct hit and the dive to save Gurbaz.

A diving Rahmanullah Gurbaz is safely home.

He dropped Tanzim Hasan's first ball towards square leg and set off rapidly, just managing to beat a swift bit of fielding.

Image source, Getty Images

Well, that's an action-packed start!

We've got an umpire review for a run-out at the non-striker's end!

The Bangladesh team are out on the field, their fast bowlers flailing their arms around to get warm.

And here come the Afghanistan openers - we're almost ready.

Image source, Getty Images

Time for the anthems in St Vincent.

Bangladesh go first, their voices no doubt carried by a stiff breeze that's blowing across the ground.

So where do we stand?

One of these sides will hope to be playing a semi-final against South Africa in Trinidad at 01:30 BST on Thursday morning, and it's Afghanistan in pole position. A win today in St Vincent, or, heaven forbid, a washout, and they go through.

If Bangladesh win, then they, Afghanistan and Australia will all be will be tied on two points and the semi-finalists will be decided by net run-rate.

Afghanistan won't be able to progress as they already sit behind Australia on that front and a defeat would worsen their figures, while Bangladesh need a big victory to pass Mitchell Marsh's side.

Aatif Nawaz
BBC Test Match Special commentator on BBC Sounds

Perhaps no surprise that Afghanistan have chosen to bat first.

Every team that has batted first at Kingstown in St Vincent and Grenadines has gone on to win so far in the tournament.

Afghanistan: Rahmanullah Gurbaz (wk), Ibrahim Zadran, Gulbadin Naib, Azmatullah Omarzai, Mohammad Nabi, Karim Janat, Nangeyalia Kharote, Rashid Khan (c), Noor Ahmed, Naveen-ul-Haq, Fazalhaq Farooqi.

Bangladesh: Tanzid Hasan, Litton Das (wk), Najmul Hossain Shanto (c), Tawhid Hridoy, Shakib Al Hasan, Soumya Sarkar, Mahmadullah, Rishad Hossain, Taskin Ahmed, Tanzim Hasan Sakib, Mustafizur Rahman.

Bangladesh captain Najmul Hossain Shanto: "I wanted to bowl first, so really happy.

"It's a very important match for us, we have a little chance. We have to be calm and execute our plan.

"Especially the bowling we're doing a great job, I hope they'll continue."

Afghanistan captain Rashid Khan: "We would like to bat first, looking at the conditions, batting is best option.

"It's a proud moment for us to be here. We've not been in international cricket long and we've got our best chance to be in the semi-finals.

"We need to make sure we do things right, get the basics right and make sure we enjoy it. We need to play our cricket and be proud to be here.

"Everyone is so pumped up [after beating Australia], it gave us so much energy.

"Now our focus is on this game, making sure we have the same mindset, energy and have fun."

Image source, Getty Images

Afghanistan captain Rashid Khan calls correctly and decides his side will bat first.

He'll be hoping his formidable opening pair of Ibrahim Zadran and Rahmanullah Gurbaz can get his side off to a flier.

It started in the US, how it did end up like this?

First Pakistan and New Zealand went, then England were heading out, were back in, out then in again, Australia were tournament favourites for a bit, then possibly heading home... and now we get to Bangladesh and Afghanistan, two sides on the brink of their first ever World Cup semi-final.

Only one can shoot their shot - it's the final match of the Super 8s and it all comes down to this.

Let's go.