The Coach Ogoh Oduadu-led team trailed until the fourth quarter before nipping past Guinea 62-59 in their second qualification match on Saturday.
The first quarter was tied 13-13, though the Guineans went 6-0 before the Nigerians scored their first through Victor Anthony.
The second quarter went to the Guineans at 22-18, and they followed that up with a 13-8 win in the third, but the Nigerians flexed their muscles in the fourth, winning it 23-11 and taking the game and the two points with a three-point win.
