"....the flair and attack they showed in dispatching joint-favourites Nigeria impressed all who witnessed it."
-- Ludo Bagman reporting in the Daily Prophet, 2 July 2014 (Pm)
Yamaguchi was one of the three Chasers in the talented Japanese team at the 2014 tournament (Pm).
Other canon notes and references
Ryuichi derives from 竜, 龍 (ryuu) meaning "dragon" and 一 (ichi) meaning "one". He may also be named after the award winning Japanese musician and composer Ryuichi Sakamoto.
Yamaguchi derives from Japanese 山 (yama) meaning "mountain" and 口 (kuchi) meaning "mouth, entrance" (Behind the Name).
From the Web
Writing by J.K. Rowling on Pottermore:
- History of the Quidditch World Cup
- 2014 Quidditch World Cup reports
- 2014 Quidditch World Cup final
- The Daily Prophet
Pottermore enhanced reading experience: Quidditch World Cup
Screenshots of the original Daily Prophet coverage of the 2014 Quidditch World Cup on Pottermore: Imgur archive
Harry Potter Wikia: Ryuichi Yamaguchi