Centre Jonathan Davies has said Wales have to be "switched on" when they face Samoa in the World Cup.
Wales suffered a heartbreaking 17-16 defeat against holders South Africa in their opening game of the tournament.
And head coach Warren Gatland has described Sunday's game against Samoa as a "must win".
"The boys are really excited. There's obviously a lot on the game," said Scarlets player Davies.
"We were obviously disappointed from last week but we put that behind us first thing Monday morning when we reviewed the game.
"We're just looking forward now to getting out on the pitch and putting another good performance in and making sure we get the victory.
"I think we've taken a lot of positives out of the game, maybe finishing off games and making sure we're switched on for the full 80 minutes.
"The boys want to get out on that field and show that we can finish off games and put teams to the sword."
Wales head coach Warren Gatland has kept faith with the side which started last Sunday's defeat in Wellington.
And Davies believes Wales can gain momentum by sticking with an unchanged side against the Samoans.
"We're all getting comfortable with each other and getting used to how we play," said Davies.
"It is a big boost to confidence and something we're looking forward to."
Samoa began their World Cup campaign with a comprehensive 49-12 victory over Namibia in Rotorua on Wednesday.
Davies came on as a second-half replacement for Tom Shanklin when Wales last faced Samoa in 2009.
Wales narrowly won 17-13 on that occasion at the Millennium Stadium and the 23-year-old expects another tight game on Sunday.
"I played them a couple of years ago in the autumn and they're a very physical team," Davies added.
"[They are] very, very strong running and very talented on the ball and love playing an open game.
"They're very dangerous with ball in hand and they've got some key players in the back-line.
"It's going to be a tough ask for us in defence and attack and making sure we're clinical in everything we do.
"We've got to make sure we front up, keep ball and work them around the pitch."
Wales: James Hook (Perpignan); George North (Scarlets), Jonathan Davies (Scarlets), Jamie Roberts (Cardiff Blues), Shane Williams (Ospreys); Rhys Priestland (Scarlets), Mike Phillips (Bayonne); Paul James, Huw Bennett, Adam Jones (all Ospreys), Luke Charteris (Newport Gwent Dragons), Alun Wyn Jones (Ospreys), Dan Lydiate (Dragons), Sam Warburton (Blues, capt), Toby Faletau (Dragons).
Replacements: Lloyd Burns (Dragons), Gethin Jenkins, Bradley Davies (both Blues), Andy Powell (Sale Sharks), Tavis Knoyle, Scott Williams (both Scarlets), Leigh Halfpenny (Blues).
Samoa: Paul Williams; Sailosi Tagicakibau, George Pisi, Seilala Mapusua, Alesana Tuilagi; Tusi Pisi, Kahn Fotuali'i; Sakaria Taulafo, Mahonri Schwalger (c), Anthony Perenise, Daniel Leo, Kane Thompson, Ofisa Treviranus, Maurie Faasavalu, George Stowers.
Replacements: Ti'i Paulo, Census Johnston, Joe Tekori, Manaia Salavea, Jeremy Sua, Eliota Sapolu Fuimaono, Tasesa Lavea.