After conceding an early goal, the Ajax goalkeeper was called to action more than twice in the first half and he did his job well to keep his side in the game.
Fai made up for his lacklustre defending in the opening minutes with two assists that powered Antonio Conceicao's side to victory.
He also tried to find the back of the net but his attempt was denied by the woodwork.
Struggled to impress in the first 45 minutes which gave the Ethiopians a chance to test Onana before the break.
The experienced centre-back did not co-ordinate the defence enough as they conceded a cheap goal but the defensive showing changed for the better after the restart.
Contributed to the Indomitable Lions' comeback quest with his vital runs and defensive tackles when needed.
The Young Boys midfielder was cited for his dribbles in the game which contributed to Cameroon's dominance.
He also supplied Aboubakar with an assist to extend Cameroon's lead to 3-1 in the 55th minute.
He was arguably the creative link between the midfield and the attack in the game. He capitalised on the Indomitable Lions' counter attack to slot a through ball for Toko Ekambi's second goal in the 67th minute.
The Napoli man did not fall short of his assignment in the middle of the park, with his tackles, passes and composure.
Anguissa made the most tackles and interceptions in the encounter.
Choupo-Moting was seen playing an unfamiliar role to drop back but he was replaced before the hour-mark after finding it difficult to break Ethiopia's defence, with no shot on target.
He tested Ethiopia goalkeeper the most with five shots and he was close to grabbing a hat-trick but his header in the 39th minute hit the post.
Aboubakar continues to lead the Indomitable Lions by example and his hunger for goals. He scored two goals within two minutes before he was substituted in the second-half.
Lea Siliki boosted Cameroon's midfield after his introduction for Choupo-Moting in the 56th minute.
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