Nigeria went back to their old style of play by playing from the flanks as Ahmed Musa and Samuel Chukwueze gave the South Africans wing backs a run for their money.
The team's determination to win today's encounter against South Africa showed the fighting spirit among the players despite some early flaws that nearly cost the team.
At this event, Nigeria finished second in Group B after beating Burundi and Guinea 1-0, before going down 2-0 to Madagascar when resting players. One win (over Egypt on Saturday) doesn't make us favourites.
However, in a rebuttal Bafana Head Coach Stuart Baxter returned the compliment with a slight dig, " I don't think he's fooling anybody", he said in his presser.
South Africa did not have a good start to the campaign, losing to the Ivory Coast and Morocco by a lone goal each. The team's goal difference is neutral after winning twice by the same scoreline, while Nigeria has displayed more consistency.
South Africa just squeezed into the knockout stages as the last third-place qualifier, but a 1-0 shocking win of tournament host Egypt will put Nigeria on high alert leading into the last eight. Can they spring an another upset this evening against the Super Eagles? They managed to keep a clean sheet each of their opening four qualifying matches.
"If I don't win the golden boot but won the trophy I'd be very happy because we are here to do that", Ighalo said ahead of Wednesday's clash against South Africa.
"I think we know we've got a tough opponent".
The game looked set for extra time before Williams flapped at a cross to leave Troost-Ekong with a simple finish.
He had failed to be amongst the goals till the round of 16 clash but with the two goals against Cameroon, we have Nigeria's Odion Ighalo coming.
Senegal must wait until Thursday to find out who they will face in their first Afcon semi-final since 2006, with Tunisia and surprise packages Madagascar meeting in Cairo.
However, Cisse warned Senegal would pay the price for looking any further than Wednesday's quarter-final with Benin in Cairo.