Wales clung to an eight-point lead with seven minutes left until a strong carry by Leigh Halfpenny scattered the Uruguayan defence and opened up a hole for Tomos Williams to settle the matter with the bonus-point try.

Coach Warren Gatland was a picture of discontent for much of the evening as his team were denied four tries, including two from forward passes.

The Welsh had come into match with 13 changes and a patched-up backline with Dan Biggar sidelined after his second head knock of the tournament and flanker Justin Tipuric standing in as captain for the rested Alun Wyn Jones.

A moment of silence was held before the game for victims of Typhoon Hagibis, which pounded into Japan's main island of Honshu on Saturday.

Wales dominated possession in the early exchanges but sloppy handling and a disallowed try initially thwarted them.

But with their try-line under siege, Uruguay's resistance broke in the 17th minute as prop Nicky Smith was driven over the line.

Uruguay responded well and almost hit back with their own try minutes later, but a long pass from Felipe Berchesi drifted forward to winger Leandro Leivas on penalty advantage and Berchesi kicked for three points instead.

Wales were denied a second try in the 25th minute, with Hadleigh Parkes putting winger Hallam Amos over with a forward pass.

Not even a chorus of singing from Welsh fans could help Gatland's side as they turned over the ball deep in Uruguay's 22 and gave Berchesi a second penalty in front of the posts.

It was all back-slapping and smiles among the Uruguayans as they jogged off with only a 7-6 deficit at halftime.

Wales re-booted after the break, testing Uruguay with the high ball.

Bradley Davies was bundled back over the line near the posts by the desperate Uruguayans but the big lock's strong carry created an overlap out wide and an unmarked Josh Adams cantered over at the left corner after a long pass from Rhys Patchell.

Wales were threatening to break the game open, but the scrappy play returned as Parkes' horror night continued.

The inside centre blew a third try for Wales by putting Amos over the line with another forward pass.

A yellow card to Uruguay flanker Santiago Civetta eased the pressure and paved the way for a penalty try as Wales rumbled a maul toward the line.

Yet Uruguay rallied brilliantly, with hooker German Kessler diving over from in close to throw a scare through the Welsh in the 71st minute.

Wales rose to the challenge as Williams grabbed the bonus-point try.

In a madcap finish, Gareth Davies ensured Wales finished on a high note as he burned away from the Uruguayan defenders after a turnover to cross under the posts.

The Welsh win ensures Australia will play England in another quarterfinal.

Australian Associated Press