Oooof! The second delivery swings back in and shaves past Guptill's midriff and over the stumps by not too much. A good leave.

The floodlights are on, but it's going to be quite a while before they take any kind of effect on a glorious day in St John's Wood.

That's a good over, just the one run from it.

Mitchell Starc will take the second over.

Jason Behrendorff ambles in from the Nursery End and Martin Guptill drives into the offside for a single of the first ball.

Right, here we go - the New Zealand openers Martin Guptill and Henry Nicholls are out to try and chase down 244.

But then Trent Boult ended the 50 overs in fine style with a hat-trick!

Usman Khawaja and Alex Carey fought back with a fine partnership of 107 for the sixth wicket.

Australia continued to struggle as New Zealand cut through their top order - and Martin Guptill made up for his drops with an utterly incredible catch.

Ashic: What an achievement by Boult... A World Cup hat-trick against Australia at the Mecca of cricket

Thank you Matt, that's two hat-tricks we have live texted on in the last week! Interesting fact - my first day at a Test match saw Dominic Cork take a hat-trick in the very first over.

Anyway, on to today and let us recap Australia's innings.

It was a hectic start as Martin Guptill spilled two early chances, either side of Aaron Finch's dismissal.

Well that was fun. Everyone loves a hat-trick.

If you're sticking with us through the interval then Tim Oscroft will take you through the highlights of that innings.

Adam Williams
BBC Sport at Lord's

Superb finish there to a very good display in the field by New Zealand.

A great recovery after Martin Guptill put down two arguably difficult chances in the first five overs, including Usman Khawaja on nought on his second ball.

Then he stole the show with that stunner to dismiss Steve Smith and Jimmy Neesham decided to join the party with his beauty to snaffle Glenn Maxwell off his own bowling.

Hats off to Trent Boult, that was what death bowling is all about and a great illustration of why when the pressure is on, New Zealand will be a tough team to get past in this tournament.

Now I wouldn't often tell you stop reading this page but there's an absolute thriller going on at Headingley that will have a huge impact on this World Cup.

Pakistan are in big trouble against Afghanistan.

Follow it here.

Jeremy Coney
Ex-New Zealand captain on BBC Test Match Special

A terrific last over - he took the fielders and pitch out of play. A little bit of reverse swing, really fine bowling.

It makes you think that Boult could have come on at 92-5. I think Williamson missed a wee trick there.

This looks like being a good game. Australia have done well to recover from where they were but has Trent Boult snatched the momentum?

Everyone in the Long Room stands and applauds the players.

Boooo. No wicket this time.

Australia end on 243.

C'mon, Trent. Make it four from four...

No bat!

Has he hit it?

It looks like it has hit the back ankle on the full.