The bookmakers made Belgium just 2/5 (1.40) to beat Japan in the last 16 of the World Cup before a ball was kicked in Rostov.
The odds compilers certainly underestimated the Asian side, but it was the Red Devils who eventually came through a tie that burst into life after half time.
dabblebet now price Belgium as 11/2 (6.50) shots in their latest World Cup outright betting market.
The Europeans have secured their place in the next round of the competition but it certainly wasn't as straightforward as the prices suggested it should have been.
Japna, the team that were favourites to finish bottom of Group H before the tournament got underway pushed one of the more fancied sides all the way.
After 52 minutes of play the Samurai Blue had established a 2-0 lead courtesy of goals from Genki Haraguchi and Takashi Inui.
Roberto Martinez was forced into changes, bringing on Nacer Chadli and Marouane Fellaini. The latter was responsible for Belgium's equaliser five minutes after Jan Vertonghen's looping header had got the Red Devils back into the contest.
Belgium pushed for a winner in normal time but the tie looked destined for extra time.
Romelu Lukaku had scored four goals in two appearances in Russia before this game but missed two very presentable headed chances once parity was restored.
In the end though, Belgium did find a breakthrough. A rapid counter attack from a Japan corner led by Kevin De Bruyne saw Chadli slot home after a sublime stepover from Lukaku.
That proved to be the last kick of the game and saw the Red Devils through to the quarter finals for the third time in their history.
Brazil (5/2) remain the team to beat according to the bookmakers having beaten Mexico earlier in the day.
They will face Martinez's men in the quarter finals in Kazan on Friday and Selecao boss Tite will certainly be encouraged by what he saw of their next opponents, especially defensively where they looked particularly vulnerable.