The Wales v Scotland head-to-heads which show Pivac's side have the edge in just one position

Wales welcome a confident Scotland to Cardiff this weekend after a very different opening round for the two sides.

While Scotland were celebrating another Calcutta Cup victory over England, Wales were heading back from Dublin with their tails between their legs after a one-sided defeat to Ireland.

Wales need to bounce back, Scotland need to end a Cardiff hoodoo that stretches back 20 years.

Here's how the two teams compare on paper, based on current form, ahead of kick off...

At his best, Williams undoubtedly a world-class full-back but he isn't there on recent showings.

Fellow Lion Hogg is a crucial part of Scotland's side. He leads by example - as demonstrated by last weekend's victory.

Brought back into the Test frame in the autumn, Cuthbert returns to the Six Nations for the first time in five years. However, he's hardly had much action in recent times.

As for van der Merwe, the Lions winger was the pick of Scotland's backs against England. A strong runner who is going to find space one way or another, just through the sheer volume of carries alone.

There'll be no winger in midfield this weekend. Instead, Watkin makes his first start for Wales since the clash at Murrayfield last year. Reliable enough, but he's been out of the fold for some time. His last start in a red jersey was the clash with Scotland at Murrayfield this time last year.

He'll be up against a Lion in Harris. The Gloucester centre's stock rose rapidly last year with his impressive defensive nous, but he was a little quiet last week.

A limitless bundle of energy who never stops moving and never stopped tackling in Dublin. But perhaps didn't offer as much in attack as you'd hope to see.

He'll have his work cut out with Tuipulotu. The Glasgow centre has