By Samuel Akpan
Lionel Messi broke the deadlock in the 29th minute, finishing a move started by Lautaro Martínez to give Argentina a 1-0 lead at the interval.
The African side deservedly restored parity in the 59th minute when D. Duarte converted a pass from R. Mendes.
Argentina appeared to have regained the advantage early in extra time when Lautaro Martínez struck in the 92nd minute from an assist by Alexis Mac Allister.
Argentina hold the record for the most World Cup matches that have gone beyond 90 minutes, with 12 such games compared to 11 each for Germany and Italy.
The decisive moment arrived in the 111th minute when Cape Verde defender D. Borges turned the ball into his own net under pressure, putting Argentina 3-2 ahead.
Argentina held firm despite the numerical disadvantage to secure their place in the Round of 16.
Cape Verde earned widespread admiration for pushing the defending champions to the brink of elimination.
Meanwhile, Argentina have advanced to face Egypt in the Round of 16 after surviving one of their sternest examinations yet at this World Cup.
