Gregor Townsend's eyes turned to a likely quarterfinal decider against Japan on Sunday with the selection of his Scotland team to play Russia in their Pool A clash in Shizuoka Wednesday.
Scotland need to beat both Russia and the tournament hosts with a four-try bonus point to ensure they qualify out of the pool, where they are likely to face either South Africa or New Zealand.
Townsend has taken a risk and made 14 changes to his side that got their World Cup campaign back on track with a 34-0 win over Samoa last week after they were humiliated by Ireland in their opening game.
Darcy Graham is the only player retained from the starting side to face Russia, although he has switched from the right to the left wing.
"We have got Japan in the back of our minds," Townsend told reporters on Monday. "At the front of our minds is the Russia game. We need to win and to get a bonus point, otherwise we are going home."
Townsend said they had been impressed with a Russian side that was improving throughout the tournament and had a strong defence and solid set piece.
They also impressed with the way they frustrated Ireland, who only managed to secure a bonus point with their fourth try in the final quarter.
Meanwhile, Wales flyhalf Dan Biggar has overcome a head injury and been named in the starting 15 for Wednesday's clash with Fiji in a major boost for Warren Gatland's side as they look to top Pool D.
Biggar, 29, suffered a head knock in their 29-25 victory over Australia and was replaced in the 29th minute by Rhys Patchell after failing a head injury assessment at Tokyo Stadium.
Gatland has retained a strong side for the Fiji challenge at Oita Stadium, with only two changes, both in the back row.
Flanker James Davies comes in for openside Justin Tipuric to make his World Cup debut after missing the pool games against Georgia and the Wallabies.
Ross Moriarty has been promoted from the bench to start at number eight, with Josh Navidi shifting across to the blindside.
"Justin was disappointed, but he will probably start the game against Uruguay and bring some experience to that side," Gatland said of Tipuric's omission from the matchday squad.
"He was tight in his quad before Australia. He was 100 percent fit for that game and he was 100 percent available for this game as well. We are trying to look at that bigger picture."
Wales, who face Uruguay in their final pool match, will assure themselves a quarter-final place with victory over the Fiji.
They will hope to avoid a repeat of the 2007 World Cup epic when they were upset 38-34 by Fiji in Nantes, the shock of the tournament.
A loss would be unlikely to upset their run to the quarter-finals in Japan but it could see them finish second in the group behind Australia and end up with a tougher run through the knockout rounds.
Scotland starting XV to face Russia:
15. Blair Kinghorn, 14. Tommy Seymour, 13. Duncan Taylor, 12. Pete Horne, 11. Darcy Graham, 10. Adam Hastings, 9. George Horne, 8. Ryan Wilson, 7. Fraser Brown, 6.John Barclay (C), 5. Ben Toolis, 4. Scott Cummings, 3. Zander Fagerson, 2. George Turner, 1. Gordon Reid
Replacements: 16.Stuart McInally, 17. Simon Berghan, 18. Willem Nel, 19. Grant Gilchrist, 20. Magnus Bradbury, 21. Jamie Ritchie, 22. Henry Pyrgos, 23. Chris Harris
Wales starting XV to face Fiji:
15. Liam Williams, 14. George North, 13. Jonathan Davies, 12. Hadleigh Parkes, 11. Josh Adams, 10. Dan Biggar, 9. Gareth Davies, 8. Ross Moriarty, 7. James Davies, 6. Josh Navidi, 5. Alun Wyn Jones (C), 4. Jake Ball, 3. Tom Francis, 2. Ken Owens, 1. Wyn Jones.
Replacements: 16. Elliot Dee, 17. Rhys Carre, 18. Dillon Lewis, 19. Aaron Shingler, 20. Aaron Wainwright, 21. Tomos Williams, 22. Rhys Patchell, 23. Owen Watkin.