Wales coach Gareth Williams has made six changes, one positional, for their crunch Under-20 World Championship clash with France in Argentina.
World champions France are a point ahead of Wales in Pool A courtesy of a bonus-point victory over Fiji.
Wales dug deep to beat hosts Argentina 30-25 last Tuesday and know they need another victory with the three pool winners and the best runner-up qualifying for the top four final play-offs.
Flanker Iestyn Rees, who impressed after substituting Lennon Greggains against Los Pumitas, starts in the back-row at Rosario's Racecourse Stadium while Ed Scragg comes in for Morgan Jones at lock.
Head injury victim Aneurin Owen is replaced by Max Llewellyn with Tiaan Thomas-Wheeler switching from outside-centre to inside.
Illness has resulted in star scrum-half Harri Morgan being demoted to the bench with Dafydd Buckland starting.
The final changes sees Tomi Lewis coming in to the side at right wing for Rio Dyer.
You can follow the build-up and all the action here with our live blog below. The vital match kick-offs at 5pm.
Wales U-20: Ioan Davies; Tomi Lewis, Max Llewellyn, Tiaan Thomas-Wheeler, Ryan Conbeer; Cai Evans, Dafydd Buckland; Kemsley Mathias, Dewi Lake (capt), Ben Warren, Ed Scragg, Jac Price, Iestyn Rees, Tommy Reffell, Jac Morgan.
Subs: Will Griffiths, Garin Lloyd, Rhys Davies, Tom Devine, Nick English, Morgan Jones, Lennon Greggains, Harri Morgan, Sam Costelow, Deon Smith, Rio Dyer.
