A double substitution for the men in red, with Ross Morriaty  and Dominic Day replacing James King and Luke Charteris. The new forwards straight into action, helping form a driving maul from a line-out a smidgen outside Uruguay's 22. 

Four tries from Wales in the first half, but how many will they go on to get? 

Ireland have scored the most in the tournament so far, crossing the line seven times in their 50-7 win over Canada, with England scoring five tries in the opening day 35-11 win against Fiji.

Wales will score more, but things aren't quite going to plan at the moment - Rhys Priestland missing a touch-finder, a common error from teh outside-half, and then proceeding to lose the ball in the tackle. 

Hallam Amos breaks through from midfield, but he is tackled and caught isolated and those pre-planned moves not quite coming off for the Welsh. 

Image source, Reuters

Rhys Priestland attempts the chip over the Uruguay defence, but the men in blue are alert to the tactic. 

Wales have an opportunity to go again, though, Jake Ball and Luke Charteris doing the dirty work before giving Priestland the chance to cut the backs loose again... 

The players are back on the pitch and it's Rhys Priestland who gets the game started again. There's been a change in the Welsh pack, too, with Samson Lee being replaced by Tomas Francis. 

Image source, EPA

Uruguay flanker Matias Beer has made the most tackles (7) in the opening 40 minutes, but illustrates that Uruguay have spent the majority of the half under the cosh. 

Image source, AFP

Wales were 6-0 behind inside the opening 10 minutes but dominated from then on, as these statistics show.

Image source, Opta

Image source, BBC Sport

It's not always been pretty but so far, so effective from the Welshmen. That injury to Liam Williams could be a big worry, however. 

Martyn Williams
Former Wales captain

From one masterful seven to another...

"Brilliant play from Justin Tipuric. It was his composure, taking the ball in one hand and passing it to Hallam Amos, who set up Cory Allen."

Image source, AP

And with that conversion the first half ends. Off the players go. 

Rob Jones
Former Wales scrum-half on BBC Radio 5 live sports extra

"Uruguay needed to regather themselves at half-time but once Wales got the ball in their hands, it was all about a try. Great work from Tipuric, and although we've not seen a huge amount from Allen he's got a hat-trick.

"It's been a good, professional and disciplined performance from Wales. Uruguay have competed well, but Wales are starting to find thee spaces out wide. It could be a long second 40 minutes for Uruguay."

Click the Live Coverage tab at the top of this page for a choice of radio commentaries.

James King punished for not binding at the scrum and this is scrappy from the Welshman, gifting Uruguay the ball. There'll be plenty for Warren Gatland to talk about at half-time. 

Image source, Reuters

The crowd groan in unison as they watch another promising Wales move ruined. Cory Allen passing into touch instead of to Alex Cuthbert as the backline attempt to spin it wide. Cuthbert looks skywards, as frustrated as the Millennium Stadium crowd. 

Silly errors stopping Wales' attack from flowing freely. Just when Jake Ball looks to have punctured the Uruguay defensive line, referee Romain Poite blows his whistle for accidental blocking. 

Martyn Williams
Former Wales captain on BBC Radio Wales

"Liam Williams got walloped again in the leg, he doesn't want to come off but he has had the nod. I agree with that, get him off the field and right for Friday.

"I totally agree. We saw what happened to Wales' first-choice full-back Leigh Halfpenny, who was ruled out before the tournament by injury.

"A game like this is tailor-made for Matthew Morgan."

Liam Williams shakes his head as he leaves the field. The full-back seems to be suffering with a dead leg which hopefully won't ruin his chances of playing against England, but he does need game time after his recent injury absence. Matthew Morgan is is replacement. 

Image source, AP

Such is the pressure of having to defend against Wales' giants, Uruguay are frequently straying offside and that gives the Welsh the chance to go for another line-out. The men in blue holding firm, though, and it's another botched attack from the Welsh. 

Image source, Reuters