Tunisia fought back to earn a 1-1 draw with Nigeria as Guinea and Niger drew 2-2 in the sides’ second Group C matches at the African Nations Championship (CHAN) in Rwanda.
Nigeria, who would have qualified for the next round with a win, went ahead through Elvis Chikatara on 51 minutes.
But Tunisia levelled on 69 minutes when Ahmed Akaichi headed in.
Akaichi came close to scoring a winner for Tunisia but was denied by a goal-line clearance by Kalu.
The result meant Nigeria stayed on top of the group, with four points, and Tunisia moved to second on two points.