Image source, BBC Sport

It's a really close contest in Tokyo between two sides right next to each other in the world rankings.

Wales failed to make the most of the early Japan yellow card but lead at the break.

Wales fans... happy with that first half?

Ceri Coleman-Phillips
BBC Sport Wales rugby reporter

That was a really untidy half when we expected so much attacking rugby from both sides.

The greasy conditions are playing a huge part and it looks like Wales are going to have to win this one ugly.

Philippa Tuttiett
Former Wales international on BBC One Wales

From a Welsh perspective, they've got to be quicker at the breakdown, the Japanese team are straight in over the ball.

From Japan's perspective, they need to look to utilize their kicking game, they've got some fast players on the outside edge.

Image source, Getty Images

Japan had to soak up a lot of pressure then and will be very pleased to hear the whistle.

That first half was a real contest.

Wales just ahead at the break.

Wales have really taken ownership of this game and are sniffing a second score before the break.

Sisilia Tuipuloto carries hard and Seren Lockwood probing for another break.

Elinor Snowsill
Former Wales fly-half on BBC Radio Wales

That is brilliant play from Wales.

We spoke about their game management and that was mature play from them.

They knew Japan were expecting the driving maul and then a really good opportunistic try from Seren Lockwood, she's been fantastic.

Caryl mentioned patience... and you get the sense they are starting to take a hold on this game.

Pressure is starting to build and another penalty conceded by Japan.

Wales really want a score before the break.

Caryl James
Former Wales wing on BBC Radio Cymru

Wales are making hard work of their attack at the minute.

Kate Williams try to offload when that was a good tackle, there is no need, they need to be a bit more patient.

Kelsey Jones to Alex Callender is becoming Wales' go-to at the lineout.

But again Japan's counter drive is causing the Welsh forwards so many problems.

Wales try to muscle their way through in midfield but a big double-hit on Kate Williams sees the Wales flanker cough up the ball.

More than half an hour gone and still no score! But plenty of action.

Philippa Tuttiett
Former Wales international on BBC One Wales

This is a real arm wrestle at the moment, a real test for the leaders of the team.

They need to work out how to break this situation and get the upper hand.

Freya Bell and Carys Cox are such a powerful midfield combination for Wales. A right pair of bruisers.

But again Keira Bevan tries to slide a kick through along the ground and it comes to nothing.

You can see the thinking behind it with these wet conditions... but it hasn't paid off yet.

Elinor Snowsill
Former Wales fly-half on BBC Radio Wales

Wales will be really disappointed with that driving lineout, they would have been expecting to score.

But Japan defended it really well and forced the turnover.

Wales had a real opportunity then with the attacking lineout.

Alex Callender gathered to set up the maul but a great counter-thrust from Japan sees the Welsh drive just disintegrate.

Psychological boost for the hosts.

While Japan look impressive up front, their game falls apart as soon as play is spread out wide to the backs.

The ball is probably like a bar of soap in these conditions but that's the third time one of the centres has dropped possession.

Ball and Bevan get a foot to the ball and Wales clear the danger.

Philippa Tuttiett
Former Wales international on BBC One Wales

This is a bit of a wake up call for Wales.

Japan are ready to strike off their mistakes, frustrating from the Welsh point of view.

Ceri Coleman-Phillips
BBC Sport Wales rugby reporter

I'm surprised to see Keira Bevan kicking so much in this first quarter.

Her point of difference from Lleucu George is keeping the ball in hand, which worked really well against South Africa.

Elinor Snowsill
Former Wales fly-half on BBC Radio Wales

There were five penalties against Wales when they were a player up so they didn't have any opportunity to take advantage of the extra player.

Japan turn defence into attack with a big hit on Kelsey Jones in midfield that dislodges the ball.

Japan punt the ball upfield and the chase is so good on Carys Cox that Wales can only scramble the ball out.

Attacking lineout for Japan.