The Africans, playing in their first World Cup, had twice come from a goal down to silence the vast majority of the crowd of 64,478 packed into a hot and humid Miami Stadium.
Six minutes into the second period of extra time, Lionel Messi swung a corner into the box and Cristian Romero rose to head home off the arm of Cape Verde centre back Diney Borges and finally set up a date with Egypt in Atlanta next Tuesday.
Messi had, almost inevitably, given Argentina the lead in the 29th minute with his seventh goal of the tournament but Deroy Duarte equalised just before the hour mark.
The Blue Sharks held on to send the match into an additional half hour before Lisandro Martinez lashed a sumptuous shot into the roof of the net in the second minute of the first period of extra time to put Argentina ahead again.
Cape Verde were not done yet, however, and left back Sidny Lopes Cabral curled a beautiful shot into the top corner of the net in the 103rd minute of the contest to put the scores back on level terms at 2-2.
Lopes Cabral could have equalised again after Romero’s goal but his finely struck free kick was saved by Argentina goalkeeper Emiliano Martinez, who had to be at his best to deny Cape Verde in the dying minutes.
Cape Verde were beaten but far from outclassed by the three-times world champions as they put in a fourth magnificent display of teamwork and grit at their first World Cup.
The only one of the four World Cup debutants to make it to the last 32 and ranked 67th in the world coming into the tournament, Cape Verde had hoped to frustrate Argentina as they did Spain, Uruguay and Saudi Arabia in group-stage draws.
They succeeded, while showing no shortage of quality of their own, for much of the game with a never-say-die desperation and a neat pass-and-move game.
Messi aside, Argentina were largely bereft of ideas against an obdurate defence and Cape Verde libero Kevin Pina was the most impressive player on the park for long periods of the contest.
It was Argentina who made the breakthrough in the 29th minute, however, when Lisandro Martinez lofted a long ball over the top of the defence to the feet of Messi.
The 39-year-old maestro took a touch with the outside of his left boot and buried it in the roof of Vozinha’s net for his 20th goal over six editions of soccer’s global showpiece.
Cape Verde knew they would need to score to keep their World Cup campaign alive and Duarte fired a shot at goal soon after halftime that drew a diving save out of Martinez.
Just before the hour mark, captain Ryan Mendes was freed down the right and his pass into the box found the Dutch-born midfielder, who controlled the ball with his left foot before drilling it past Martinez with his right.
Messi had a chance to put Argentina back in front four minutes later when he was played through on goal, but Vozinha stood up well to keep his shot out of the net.
One of Messi’s trademark free kicks was tipped away by Vozinha in the 72nd minute and Cape Verde defender Pico Lopes had to intervene to prevent Enzo Fernandez from scoring 10 minutes later.
Cape Verde held on to force the dramatic period of extra time and they will now return home heroes having put their tiny island-nation firmly on the footballing map. (Reuters)
