South Korea's 2-0 dethroning of the defending champion Germany could have been viewed as a one-off, if not for Japan's heartbreaking defeat to star-studded Belgium days later in the last 16, AFP reported.
Iran also came desperately close to beating Cristiano Ronaldo's Portugal, the European title-holder, in another sign that smaller teams may be closing the gap on the game's traditional powers.
None of the Asian Football Confederation teams reached the quarterfinals, extending a barren run which stretches back to the 2002 World Cup in Japan and South Korea.
But Japan, South Korea and Iran departed Russia with their heads held high and positive expectations for Qatar 2022, when the World Cup returns to AFC territory for the first time in 20 years.
"The AFC nations can take great encouragement from this year's World Cup," Andy Jackson of FourFourTwo magazine told AFP.
"(They) can look forward to 2022 and an AFC-hosted World Cup in Qatar with the hope of being one of the nations causing some of the famous upsets we've seen so far in Russia."
AFC teams amassed 15 points in Russia, their best showing yet – and overshadowing Africa's representatives Egypt, Morocco, Nigeria, Tunisia and Senegal, which went home after the group stage with 11 points between them.
'Stand with elites'
However, Saudi Arabia, another AFC side, never recovered from its 5-0 spanking by Russia in the tournament's opening game, and Australia – the Asian champion – also had a World Cup to forget.
Despite looking competitive in their group games against France, Denmark and Peru, the Socceroos failed to win a game and they went home without scoring a goal from open play.
Out of the Asian teams, Japan emerged with the most credit after it reached the last 16 and was 2-0 up against Belgium with 21 minutes to go – before the Belgians launched one of the great World Cup comebacks, clinching a 3-2 win in injury time.
"Japan showed great quality and character to battle bravely with one of the best teams in the tournament," said AFC president Sheikh Salman bin Ebrahim Al Khalifa.
"Their success exemplifies the great progress of Asian teams to stand proud with the world's elite."
Japan's image was also burnished by images of its fans tidying up stadiums after games – while a picture of Japan's spotless changing room, with a thank you note in Russian, went viral after the Belgium defeat.
"This Japanese team and its supporters left with their heads held high and their standing and respect in world football greatly enhanced," Jackson said.