KANSAS CITY, Missouri, July 5 : Argentina and Egypt head into their World Cup last-16 clash on Tuesday in Atlanta with little time to recover after both survived gruelling physical tests in their first knockout matches.Reigning champions Argentina needed extra time to edge World Cup debutants Cape Verde 3-2 on Friday, while Egypt endured 120 minutes before defeating Australia 4-2 in a penalty shootout after a 1-1 draw.The quick turnaround has raised concerns for both teams, but particularly for Argentina, whose previously flawless campaign showed signs of vulnerability for the first time.After cruising through the group stage, Lionel Scaloni's side struggled to impose themselves against Cape Verde, prompting debate over whether the performance was an isolated stumble or evidence of weaknes