Nigeria recorded a 1-0 victory over Guinea on Wednesday to qualify for the 2019 Africa Cup of Nations Round of 16.
The only goal, scored by defender Kenneth Omeruo made Nigeria the first team to advance from the group stage, with Guinea now in danger of crashing out after a 2-2 draw in the first game.
Coach Gernot Rohr had made major changes to the side that started against Burundi, dropping John Obi Mikel, Samuel Chukwueze, Shehu Abdullahi and William Troost Ekong, and replacing them with Ahmed Musa, Odion Ighalo, Chidozie Awaziem and Leon Balogun.
The best chance of the first half came to Nigeria in the 32nd minute when Odion Ighalo failed to score from a one-on-one with goalkeeper Ibrahim Line. He also had an option of passing to Ahmed Musa, but did not.
On the hour mark, Ahmed Musa had a run from the midfield, dribbling two Guinea players and finding Ighalo in the 18-yard box, but the ball was blocked by an on-rushing defender.
One minute later, Iwobi took a straight shot, but Line's hand was stretched enough to point the ball out for a corner.
With 17 minutes remaining on the clock, the Super Eagles got a corner kick, taken by Moses Simon, and a high-flying Kenneth Omeruo nodded in to give Nigeria the lead.
Guinea had a chance to stage a comeback in the 90th minute, but a poorly-taken freekick denied them the opportunity.
A three minute added time did not change the score as Nigeria earn all three points up for grabs.
The 1-0 victory means Nigeria are now the first team to qualify for the AFCON 2019 Round of 16 after two wins in the group stage.