"Hongo and Shingo replica Quidditch robes are now the fastest-selling pieces of merchandise at the tournament."
-- Ludo Bagman's commentary in the Daily Prophet, 2 July 2014 (Pm)
Japan used their experience to win the initial match against Poland (350 points to 140). The quarter-final was against the Nigerian National Team, which again featured "precision and creativity of shots hit" from both sets of Chasers, and was won by Japan by 270 points to 100 (following the failure of the Nigerian Seeker's broom) (Pm).
Although they were the underdogs, Bulgaria beat favourites Japan at semi-finals stage, setting up a match against the United States to secure third place. In this fixture, Shingo and Hongo were "simply unstoppable" and the final score was Japan 330 - USA 120 (Pm).
Precise, artistic and creative hitting of a Bludger, ability to dominate a Quidditch game with defensive moves
Other canon notes and references
Shintaro (Shintarō, 伸太郎, しんたろう) is usually a Japanese boy's name, with tarō in particular used in or as the name for first born sons (Wikipedia).
Shingo may be a reference to two Japanese places: Shingo (Aomori) and Shingo (Okayama), the latter of which has been merged into the town of Niimi.
From the Web
Screenshots of the Daily Prophet's coverage of the 2014 Quidditch World Cup: http://imgur.com/a/AXutv