That will go down as one of the messier scrums, but Wales somehow retain possession of the ball.

Sam Costelow once again looks to put the ball in behind, and Josh Adams is chasing it down.

The ball bounces high into the Japanese in-goal area, and Adams is competing for it with

The question is, did Ichigo Nakakusu deliberately knock the ball dead, or did he make an attempt to claim the ball?

It could result in a penalty try if it was deemed that Adams could have scored if not for the deliberate slap.

Just before the water break, Japan wing Malo Tuitama slipped a high ball forward, so we return with a Welsh scrum just outside the Japanese 22.

Japan try-scorer Takuro Matsunaga is off after receiving medical attention during the water break.

Ichigo Nakakusu is on for his international debut off the bench.

James Hook
Former Wales fly-half on BBC Radio Wales

Wales started well, but they've been quite inaccurate the last few minutes.

Japan are starting to find a little bit of space in Wales' backfield.

The players move to the shade on this near side of the pitch for a much-needed water break.

It has been a dominant 20 minutes on the field for Wales, but it is all level on the scoreboard after that try for Japan against the run of play.

We are approaching the first of two three-minute water breaks, which are in place today in the middle of each half due to the heat.

Richie Rees
Former Wales international on BBC Two Wales

That was a four-pass play, Ben Thomas and Johnny Williams got caught narrow, which allowed the Japanese team to expose Wales' defence.

Japan are turning to the boot now, to good effect.

Another kick looks destined to be a 50-22, but Sam Costelow gets across just in time.

He is under immense pressure though, and the clearing kick does not get much distance.

A first chance to attack for Japan.

Sam Costelow's kick is overhit and Seungsin Lee is able to call a mark.

The Japan fly-half's kick in reply is excellent, and only a few metres away from being a 50-22.

Fortunately for Wales the bounce is against Japan, so it will be a Welsh line-out.

Once again Wales see an opportunity come and go, as Japan steal the ball back at the first breakdown after the line-out.

As Emyr Lewis was just saying, Wales will need to start taking advantage of these chances in such warm conditions.

The Welsh scrum is on top at the moment, and they win another penalty at the set piece.

Taulupe Faletau looks to spring the attack from the base of the scrum, but the ball slips out of his hands.

Unsurprisingly Wales kick to the corner with the penalty.

It's one-way traffic at the minute, and Josh Adams is seeing a lot of the ball early on.

The Wales wing is on his bike down the left wing once again, but his grubber kick through to Kieran Hardy is slightly overhit and gathered by Japan.

But Takuro Matsunaga is forced to ground the ball in his own in-goal area, so it will be a scrum to Wales from five metres out.

Emyr Lewis
Former Wales flanker on BBC Radio Cymru

Wales have the momentum at the moment, they need to take advantage of this now, before they get too hot.

No, or not for now at least.

Japan steal the ball back at the line-out and this time the clearing kick is a good one.

Wales kick into the Japan half, and the hosts are penalised once again at the breakdown.

Sam Costelow kicks towards the corner once more. Can Wales take advantage of this early momentum?

James Hook
Former Wales fly-half on BBC Radio Wales

The situation Wales are in now means Wales need to win, especially with the World Cup draw at the end of autumn, this is an opportunity to get two wins and move up the rankings.

You look at the autumn campaign, they play New Zealand, South Africa, Argentina and Japan again, they're not easy games.

A lot has been made in the build up about how greasy the ball will get, and we have our first dropped pass on the game from Amato Fakatava.

I except there will be more where that came from as the game goes on.

A first error from Wales, as Kieran Hardy's kick goes out on the full, so Japan have a line-out on the Welsh 10-metre line.

Richie Rees
Former Wales international on Scrum V Live

Japan were too passive defensively, but Wales would've worked on this move so many times during this week.

The timing of the line from Ben Thomas made that try.