Ahmed Musa struck twice to become the first Nigerian to score at two World Cups Friday as the Super Eagles secured a crucial 2-0 win over Iceland, who missed a penalty.
The African side will secure a spot in the knockout stage if they beat Argentina on Tuesday in Group D’s final round of fixtures.
A draw would be enough to eliminate the Argentines but would leave Nigeria’s fate hinging on the outcome of Iceland’s game against Croatia.
Musa, who came into the starting line-up in place of Alex Iwobi, announced himself with two of the goals of the tournament so far.
Musa’s sweetly struck half-volley fired Nigeria into the lead just after half-time before he added a second with 15 minutes to go to make the Group D game safe.
Iceland got a lifeline in the 82nd minute with a VAR-awarded penalty but dead-ball specialist Gylfi Sigurdsson blazed over the bar.
With Croatia heading the group on six points Nigeria knew a second defeat would mean elimination and Iceland started brightest after coach Heimir Hallgrimsson changed to a 4-4-2 from the 4-5-1 he had used in the 1-1 draw with Argentina.
Alfred Finnbogason, who scored the equaliser against Argentina as a lone striker, was joined up front by Jon Bodvarsson and the pair quickly made an impact.
Captain Aron Gunnarsson launched a long throw into the box and, after Bodvarsson had made a nuisance of himself, a push gave Iceland a free-kick just outside the area.