The South American Under-23 champions were emphatic winners over Germany last time out, while the Ivorians put outsiders Saudia Arabia to the sword.
Having qualified for seven of the last nine Olympic football competitions - claiming two bronzes, three silvers and finally gold at Rio 2016 - Brazil certainly take their quest for medals seriously, as self-appointed guardians of the beautiful game.
The team they defeated in the final five years ago were once more the opposition for the defending champions' first fixture of this summer's Games, and the Selecao repeated the result - though without recourse to penalties this time - against Germany on Thursday.
Clearly dedicated to his national duty, Everton forward Richarlison headed straight to Japan after taking part in the Copa America final defeat to Argentina earlier this month and his commitment was rewarded with a hat-trick, which was followed by Paulinho's late strike to secure a 4-2 win. Though a Germany side later reduced to ten men eventually bagged two second-half goals, a comeback never looked likely.
Only once since 1976 have a Brazilian squad failed to collect a medal of some sort from a trip to an Olympic Games, so such a win was widely expected back home, but Andre Jardine's team appear to be handling the pressure suitably well.
They are certainly in fine form, as former Sao Paulo manager Jardine has now led Brazil's next generation - aided by some experienced heads - to three successive victories, by an aggregate of 12 goals to four. That threat in the final third will surely leave opponents fearing the iconic Verde-Amarela shirts flooding into their box as the tournament progresses.
Next to face the free-flowing Brazilians, fellow first round winners Ivory Coast will come into Sunday's encounter level on points with their counterparts and within a win of securing a place in the knockout phase.
The 2019 African Under-23 Cup of Nations runners-up - who nonetheless earned a place in these Games despite suffering a 2-1 extra-time defeat to Egypt in the continental tournament - were winners against Saudi Arabia on Thursday.
It was Milan midfielder Franck Kessie who eventually thumped home a typically powerful strike in the 66th minute to seal maximum points for the Ivorians. His supporting run for Manchester United forward Amad Diallo was rewarded when he received the ball on the edge of the area, made a quick turn and fired between two helpless defenders.
An impressive opening performance in a more dynamic box-to-box role than the deep-lying job he is restricted to with the Rossoneri demonstrated Kessie's undoubted abilities, and his inclusion as one of coach Soualiho Haidara's overage players could make all the difference in helping the West African side get through to the final eight.
In fact, the ex-Atalanta man's fellow Serie A star, full-back Wilfried Singo, has stated the squad are intent on surpassing even their fans' high hopes to portray a positive image of the country worldwide, speaking of their privilege in representing Ivory Coast at these uniquely global Games.
Though Arsenal defender Gabriel Magalhaes and Marseille new-boy Gerson were both withdrawn from the squad before departure, Brazil have a deep and versatile squad to choose from. However, head coach Andre Jardine is expected to largely keep faith with the XI that started the opening game.
Matheus Cunha had a penalty saved in first half stoppage time against Germany as his side had to settle for a mere three-goal advantage at the break, and he missed other chances too but will probably start once again. In their customary 4-3-3 formation, any two from Paulinho, Antony and ex-Barcelona winger Malcom will join Richarlison in support of the Hertha Berlin frontman.
Having fulfilled a creative midfield role and featured on the right wing at times since his return to the Brazilian top flight, ageless veteran Dani Alves continues at right-back, with fellow senior players Diego Carlos and goalkeeper Santos also lending their experience to the back line.
Ivory Coast, meanwhile, will be forced into at least one change, as Maccabi Netanya forward Aboubacar Doumbia was sent off late in the second-half of their win over Saudi Arabia and will miss out on a place on the bench as he serves a suspension.
The first XI, however, should remain intact, with Manchester United teenager Amad Diallo set to keep his spot on the right flank, while Max Gradel targets any space left by the raiding runs of Dani Alves on the opposite side.
Midfield lynchpin Franck Kessie and Diallo's United colleague Eric Bailly add steel and experience to the spine of Soualiho Haidara's young side.
Brazil Under-23s possible starting lineup:
Santos; Alves, Carlos, Nino, Guilherme; Luiz, Guimaraes, Claudinho; Paulinho, Richarlison, Cunha
Ivory Coast Under-23s possible starting lineup:
Tape; Singo, Bailly, Dabila, I. Diallo; A. Diallo, I. Doumbia, Kessie, Eboue, Gradel; Kouame
We say: Brazil Under-23s 2-1 Ivory Coast Under-23s
Unsurprisingly, given their wealth of attacking talent, Brazil cannot stop scoring at the moment and even a capable Ivory Coast team are unlikely to keep them at bay for a full 90 minutes.
In fact, the Selecao should register at least twice, as their well-stocked bench is capable of adding fresh impetus should any of the front three start flagging or lose form - a place in the quarter-finals is almost assured.
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