Jurgen Klopp once called Martinelli 'the talent of the century', and it looks like this will be the year we all understand what he meant.
The Arsenal man was one of nine players drafted into Tite's starting XI, with qualification for the last 16 already taken care of. And while some - his Gunners teammate Gabriel Jesus, for example - did little to boost their chances of further involvement, Martinelli played like a man determined to give his manager food for thought.
He's so direct, so positive, and his speed and control made him a nightmare for Collins Fai, the Cameroon right-back, who could do little about his forward raids down the left.
Three times, he forced saves from goalkeeper Devis Epassy, and time and again he carried the ball into dangerous areas, never disheartened when things didn't fall his way.
With Vinicius Junior firmly established as Tite's first-choice on the left, he'll do well to get another start in this tournament, but don't be surprised if he makes a huge impact off the bench at some point. This is a player who, as Klopp predicted, is going right to the top.
The future may be bright, but there's always space for a bit of nostalgia at a World Cup, and it came here in the form of the greatest right-back of the modern era.
At 39 years and 210 days, Alves became the oldest player ever to feature in a World Cup game for Brazil. This was his 125th cap, his debut having come in 2006, and a reminder to everyone that there really is no substitute for experience, professionalism and commitment when it comes to top-level football.
He isn't, of course, the marauding presence of Sevilla or Barcelona - he plays his football in Mexico these days, and hasn't played too much of it due to injury of late - but full credit to him for still being capable of performing at this level.
What a career he's had, and it may yet have a golden finale too.
Well, at least you can say he left the World Cup in memorable fashion.
What a header the Cameroon captain produced to win this game in the second minute of added time. Aboubakar, who had already provided one of the moments of the tournament with his scooped finish against Serbia, timed his run perfectly to meet Jerome Ngom Mbekeli's delicious right-wing cross, leaving Ederson rooted to the spot as his effort flew into the bottom corner.
It was a goal worthy of winning any game, and one which secured a famous, if ultimately fruitless, victory for Cameroon. Aboubakar removed his shirt in celebration, earning a second yellow card in the process. A bit daft, but it won't cost him too much as it turns out, as Switzerland's win over Serbia ensured it is they, rather than the Indomitable Lions, who progress to the knockout stage.