Son Heung-min of Spurs scored in the first half to give South Korea a win over Cameroon.
After Kim Jin-Su's strike was parried by Onana, the 30-year-old nodded home a rebound in the 35th minute.
The Central African nation lost their final two warm-up games before naming their World Cup squad.
Nicolas Moumi Ngamaleu's long-range effort was just wide midway through the first half as the coach named a strong side against the Asians.
Both Kim Jin-Su and Hwang In-Beom went close for Korea, before the latter broke free on the left to unleash a strike that wasclawed away by Onana only to sit up nicely for Son's powerful headed goal.
Pierre Kunde had a chance to win the game for the visitors, but his effort was saved in the final seconds.
The five-time African champion, who begin their World Cup campaign against Switzerland and are also grouped with Brazil and Serbia in Group G at the finals, will host Jamaica in a friendly in November.
As they continue their preparations for the World Cup, Africa's two World Cup hopefuls, Algeria and Tunisia, will play each other on Tuesday, while the other two will face off against each other later in the day.
The second friendly game in four days was abandoned in Bamako on Monday due to bad weather.
The game was stopped due to the flooding of the pitch.
After 45 minutes, the game appeared to be over as the teams ran for cover, but the players came back to the field to warm-up.
Fashion Sakala rejected claims that Zambia did not come back to the pitch before it was called off.
The Rangers forward said the Chipolopolo players wanted to impress after the loss.
He said that it was unfortunate that the game was not played.
The weather ruined things but we started well and were highly-motivated to win.
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