The sides with the best defences in the tournament go head-to-head in the quarter-finals in Montreal on Sunday. Chile have yet to concede a goal, while Nigeria have only let in one so far, in their Round of 16 win over Zambia. The lively South Americans and powerful Africans have both added attacking verve to their defensive steel, so it is hard to pick a winner here...

The match
Chile v Nigeria, Montreal, 15 July, 14.15 (local time)

The stakes
Should Chile reach the semi-finals, they would repeat their achievement of 1987, when the Rojita made the last four in the tournament they hosted. In fact, this year's exciting crop of young Chileans, led by playmaker Alexis Sanchez, are aiming even higher. Jose Sulantay's side are intent on taking the trophy home, and equally legitimately, Nigeria harbour the same ambition. Finalists back in 2005 and the last representatives from Africa this year, Ladan Bosso's boys were mightily impressive in the group stage, before struggling past Zambia in the Round of 16.

The players
Nigeria have a full squad to call upon, apart from first-choice goalkeeper Moses Ocheje, who has still to recover from the injury he picked up against Costa Rica. Ikechukwu Ezenwa will continue to deputise. Chile's Sulantay is faced with a selection headache up front. Arturo Vidal is suspended following his dismissal against Portugal and both Alexis Sanchez and Carlos Carmona are doubtful. A decision on whether they play will be taken at the last minute.

The numbers game
The only previous meeting between the two sides dates back to 2000 at the Olympic Tournament in Sydney, when the South Americans won 4-1. That was in the quarter-finals and Chile went on to finish third. Nigeria have a poor record against South American sides at U-20 level, having lost five times and drawn once in six encounters. The Flying Eagles shoud perhaps take a look at another stat. They have never lost in extra-time at this tournament in five times of asking. So in theory all they have to do is take the game into the extra half-hour.

The words
"This team is getting stronger. We're taking each match as it comes. We approach each game differently depending on the opponent." Ladan Bosso, Nigeria coach

"I'm going to play with three central defenders that's for sure. I can put Suarez on the right, Larrondo on the left and either Sepulveda or Godoy in the middle. That way I can use more mobile attacking wide players." Jose Sulantay, Chile coach.

"Our team is completely focussed and we really hope we keep going right to the end. We want to win this World Cup." Chukwuma Akabueze, Nigeria midfielder.

"All my team-mates are warriors and I want to be with them. I know what joy we are bringing the Chilean people. People believe in us and I that's why I want to take the title home." Alexis Sanchez, Chile striker.