Ten-man Belgium beat South Korea to top their World Cup group and set up a last-16 tie against the United States.
South Korea needed a win so the onus was on them to attack and they were helped when Steven Defour was sent off for a reckless tackle on Kim Shin-wook.
A Son Heung-Min cross struck the face of the Belgium crossbar but the Asian side struggled to create chances.
And Jan Vertonghen scored the Red Devils’ winner when he slotted in after a Divock Origi shot was parried.
Belgium have been criticised for a lack of flair so far in the tournament, but there is little question about their resilience as they have let in just one goal in three games and are unbeaten in their last 13 competitive matches.