The Paris Saint-Germain forward took to social media in the aftermath of the Group E victory to explain why he put his head in his hands and cried after scoring Brazil's second goal in the seventh minute of second-half stoppage time to wrap up his side's first victory of Russian Federation 2018.
Neymar's emotions at the end highlighted Brazil's relief at getting their first win of the tournament after being held 1-1 by Switzerland in their opening match.
The scrutiny will be on Neymar, but Brazil have a team packed full of talent that can hurt Costa Rica.
Costa Rica - rightly anticipating that Brazil would enjoy the lion's share of possession - sat deep but looked risky when they were given the rare opportunity to counter.
"By the time I returned the ball, he insulted me".
Marcelo's tame shot straight at Navas in the 41st minute was the first effort on target from either side before the break, and the team went into halftime with the boos and whistles of their own fans ringing in their ears.
Brazil went into halftime with the boos and whistles of their own fans ringing in their ears but emerged with a renewed sense of objective, with Jesus heading against the bar four minutes after the restart and Coutinho sending the follow-up effort narrowly wide.
Brazil stars Neymar, left, Philippe Coutinho and Marcelo celebrate.
Neymar curled around the right-hand post from 18 yards after the defence opened up for him in the 72nd minute, before the officials arrived at the correct decision via VAR to deny him a penalty.
The result means Brazil have avoided the ignominy of equalling their longest winless run at the World Cup.
- Neymar has been fouled 14 times so far in the 2018 World Cup, more than any other player.