World Rugby U20 Championship: Wales 18-17 Japan
|World Rugby U20 Championship: Wales v Japan|
|Wales (13) 18|
|Tries: H Morgan, Cross Cons: C Evans Pens: C Evans 2|
|Japan (10) 17|
|Tries: Vailea, Arai, Fifita Cons: Mori|
Wales will face Argentina on Tuesday in a World Rugby Under-20 Championship fifth-place semi-final after holding out to win against Japan in Perpignan.
Fly-half Cai Evans' goal-kicking gave Wales victory in their final Pool A game against Japan.
Results elsewhere mean England, New Zealand, France and South Africa will battle for the title.
The second tier includes Italy and Australia as well as Wales and Argentina.
Narbonne will host the Wales v Argentina game with Geraint Lewis' team hoping to improve on their display against Japan.
Wales were outscored three tries to two with wing Halatoa Vailea carving through Wales' defence for the opener.
Harri Morgan's stunning reply came before hooker Miyu reclaimed the lead for Japan and Evans' two penalties gave Wales a 13-10 half-time lead.
Dewi Cross sped clear for Wales, but Siosaia Fifita crossed and Yuto Mori converted to ensure a tense finish.
With eight points from kicks at goal, Evans, the son of former Wales and British and Irish Lions wing Ieuan, was crucial to Wales' cause as Japan converted only one of their three tries.
Centre Tiaan Thomas-Wheeler was one of nine new players for Wales, who lost 42-10 to New Zealand after beating Australia in their opening game.
Geraint Lewis' side's hopes of finishing second in Pool A rest on the outcome of the Junior All Blacks taking on their Australian counterparts later on Thursday.
Wales seem likely to enter the knock-out stages for fifth to eighth place with the next games to take place on Tuesday, 12 June in Narbonne.
Wales beat Australia 26-21 in their tournament opener, while New Zealand were 67-0 victors over Japan, who then lost 54-19 to Australia.
Wales U20: Cai Evans (Ospreys), Corey Baldwin (Scarlets), Ioan Nicholas (Scarlets), Tiaan Thomas-Wheeler, (Ospreys), Dewi Cross (Ospreys), Ben Thomas (Cardiff Blues), Harri Morgan (Ospreys); Rhys Davies (Scarlets), Dewi Lake (Ospreys), Chris Coleman (Dragons), Lewis Ellis-Jones (Scarlets), Jack Pope (Bridgend), Tommy Reffell (captain; Leicester Tigers), Lennon Greggains (Dragons), Taine Basham (Dragons)
Replacements: Rhys Carre (Cardiff Blues), Iestyn Harris (Cardiff Blues), Rhys Henry (Ospreys), Max Williams (Dragons), Ben Fry (Dragons), Dane Blacker (Cardiff Blues), Ryan Conbeer (Scarlets), Max Llewellyn (Cardiff Blues)
Japan U20: Kyohei Yamasawa; Halatoa Vailea, Sioeli Vakalahi, Yuto Mori, Siosaia Fifita; Hiroto Mamada, Shinobu Fujiwara; Gakuto Ishida, Miyu Arai, Rento Tsukayama, Kanji Shimokawa, Ryuga Hashimoto, Kai Yamamoto, Hisanobu Okayama, Asipeli Moala.
Replacements: Yuichiro Taniguchi, Yuseke Yamada, Shohei Oyama, Kaito Aibe, Shota Fukui, Atora Hondo, Itsuki Kodama, Yu Saruta.