Number 8 James Benjamin scored his fourth and fifth tries of the IRB Junior World Championship as Wales beat Samoa in the seventh place play-off.
The Dragons back row's brace, combined with a try from Ospreys wing Dafydd Howells, helped steer Wales to victory.
Samoa, who had prop Ieremia Mataena sin-binned in the first half, could only muster a penalty from centre William Talataina Mu in response.
Dragons fly-half Ethan Davies' penalty and conversion completed the scoring.
Wales U20: Dafydd Howells (Ospreys); Tyler Morgan (Dragons), Steffan Hughes (captain, Scarlets), Jack Dixon (Dragons), Ashley Evans (Ospreys); Ethan Davies (Dragons), Tom Williams (Blues); Nicky Smith (Ospreys), Scott Otten (Ospreys), Nicky Thomas (Ospreys), Joe Davies (Dragons), Rory Thornton (Ospreys), Olly Cracknell (RGC), Will Boyde (Carmarthen), James Benjamin (Dragons)
Replacements: Ethan Lewis (Blues), Luke Garrett (Dragons), Callum Lewis (Blues), Scott Andrews (Dragons), Scott Matthews (Dragons), Luc Jones (Dragons), Angus O'Brien (Dragons), Harri Evans (RGC)
Samoa U20: Fereti Saaga, Ieremia Mataena, Etimani Sului (captain), Jotham Wrampling, Cameron Skelton, Giovanni Habel Kueffner, Richard Mariota, Sootala Fa'aso'o, Emil Pittman, William Talataina Mu, Nu'u Nu'u, Nathaniel Apa, Joseph Ikenasio, Harry Luteru, Luteru Laulala
Replacements: Iafeta Luamanu, Andrew Lemalu, Louis Kapeteni, Ezra Meleisea, Joe Lee, Mark Talaese, Penaia Penaia, Aukuso Tuitama
Referee: Akihisa Aso (Japan).
Assistant referees: Angus Mabey (New Zealand), Brett Johnson (New Zealand)
TMO: Aaron Paterson (New Zealand)