Six Nations: Wales is a must-win game for Scotland - Sean Lamont

Scotland winger Sean Lamont will win his 92nd cap against Wales on Sunday

Scotland must beat Wales on Sunday to keep alive their hopes of a first Six Nations title, says winger Sean Lamont.

"It's our first home game and it's important to get back on track," said the veteran winger following last weekend's loss in France.

"If we want to win this tournament, we need to win every game from here on out.

"If we can win our three home games and steal that away win, then four out of five puts you in a damn good place."

Lamont missed the 15-8 defeat in Paris but has recovered from a calf problem to replace injured Glasgow Warriors team-mate Tommy Seymour.

And head coach Vern Cotter will be hoping the 34-year-old's experience and defensive strength can help Scotland find a way to beat Wales for the first time since 2007.

Visitors Wales are also seeking their first points, having slipped to a 21-16 home loss to England on the opening weekend.

"Wales are a quality side and they'll be hurting after sliding off after a good first-half against England," added Lamont, who will win his 92nd cap at Murrayfield.

"It's about sticking to our shape. When we do that well, we can challenge the best in the world.

"But if we get away from our shape and try to force it too much then we can come unstuck.

"We know where our standards need to be. This weekend we need to do it. If you want to win the tournament, you can maybe slip up once."

Scotland last won the trophy in 1999 before Italy were admitted to the competition.

"That's our target," continued Lamont. "We know it's a big ask. We haven't done anything like that for a long time.

"But we've grown a lot as a team in the last six to eight months.

Sean Lamont spent time playing in Wales for Scarlets

"Since Vern took over we have been moving in the right direction, with younger guys coming through and getting a bit more experience. The players understand their roles better.

"We've shown glimpses in the autumn before only to stumble at the Six Nations but there is definitely a different feeling this time.

"We're in a good place. Although we lost last week, the guys know where they can be better, where they can be sharper."

Wales hammered Scotland 51-3 in last year's Cardiff meeting following an early red card for Stuart Hogg.

"We do owe them and the guys want to get one over on them," explained Lamont.

"Emotion is a massive factor when you pull on the blue shirt but you need to peak at the right time and it can be a delicate balance.

"We just need to be physical against Wales - they're a big side."

The absence of George North following his double knock to the head in the Millennium Stadium deprives Wales of one of their most powerful ball-carriers but Lamont knows replacement Liam Williams will pose a different kind of threat.

"I quite enjoy playing against George. I know him from my time with Scarlets - he's a really nice lad," said Lamont.

"He and Liam Williams are both highly talented individuals - but as for George, I've played against bigger, I've played against faster. I've played a few games of rugby now and it doesn't worry me.

"Liam is quick and while people think he is slight, he punches well above his weight. But I don't mind who I face.

"We play these guys week-in, week-out. We know their traits and I think it's going to be a good battle.

"We can do it but we need to be on point and play for the full 80 minutes."