Daniel Munoz's deflected strike was enough for Colombia to beat DR Congo and secure their place in the World Cup knockout stage.
Roared on by the vast majority of the crowd in Guadalajara, Colombia missed a host of chances before Crystal Palace wing-back Munoz broke the deadlock in the 76th minute.
Juan Fernando Quintero's clever pass found its way to Munoz and his left-footed shot took a touch off the defender to wrong-foot DR Congo goalkeeper Lionel Mpasi and sneak in at the near post.
A second straight win puts Colombia top of Group K and clinches their place in the last 32, while DR Congo are third and need to beat Uzbekistan in their last group game to have any chance of progressing.
Match-winner Munoz was a threat throughout and should have put Colombia ahead inside four minutes, but put his close-range shot into the side netting after Jhon Arias' shot had been parried into his path.
Two minutes later, Munoz did bundle the ball into the net after his initial header was saved but, while it was very tight, he was just offside.
Colombia continued were dominant during a relentless opening 20 minutes but could not find a way past Mpasi.
They remained on top after half-time and Luis Diaz should have put them in front on 50 minutes, but could not find the net with just Mpasi to beat, while Arias dragged the follow-up wide.
But just as it seemed it would be a night of frustration for Colombia, Quintero slid the ball into Munoz's path and he beat Mpasi.
DR Congo pushed for a leveller late on but Colombia held on for a deserved victory.
In a side featuring Diaz and James Rodriguez, it seems remarkable that Colombia's greatest threat in this World Cup has come from a wing-back.
It is now two goals in two games at the tournament for Munoz - and he might reasonably think it should be more.
It is no exaggeration to say he could have had a hat-trick against DR Congo.
The one goal he scored came via a deflection, but neither he nor Colombia will care a jot given the strike sealed their qualification from the group.
Munoz's attacking threat should also come as no surprise. It has been evident throughout his time at Palace.
But if teams have been sleeping on danger the right wing-back poses so far in this World Cup, then that will surely change now.
The 30-year-old's ability to ghost in around the back, arriving late and invariably timing his runs to perfection, speaks to his experience.
This is something he has been doing for years. It is second nature to him and combating those darts from out to in is easier said than done - especially for defences already concerned about Diaz and co.
Munoz is at the peak of his powers, and among the world's best in his position, so he can expect to be high on the opposition scouting reports from now on.
Stopping him is another matter.
