Will Darbishire's try right after halftime made it 28-21 and at that point everything looked poised for a tense finish.
But it wasn't to be.
The key play here may well have been after the USA conceded Japan's 5th try. Right off the restart the ball bounced to Siale Ofa, who raced through tacklers to the corner. That try was converted, but then called back because, supposedly, the ball that bounced off Pierce Helly's shoulder went forward. That was a verrrrry close call. And harsh.
The wheels seemed to fall off after that.
Japan scored seven tries to wrap up the match 71-21.
The USA had discipline problems, too, with Spencer Huntley getting a yellow for coming into a maul from the side, and it being the latest in a long line of penalties. Moments later Alfie Booth dropped a shoulder into a player off the ball and deservedly got a red card.
The USA team got frustrated, and while they showed that they can score when they have the ball, they hardly saw it. Japan held two-thirds of the possession, made defenders miss, and the USA committed 21 penalties and missed 71 tackles.
USA U20s 21
Tries: Finicle, Mitchell, Darbishire
Convs: Cadden 3
Japan U20s 71
Tries: Iwakura 3, Fukada, Uchida 2, Suda, Miura 3, Motoyama
Convs: Niwa 8