Ajax hunted in packs and at high speed, looking to force an early mistake, to catch the Italian champions cold out of the dressing room.
From start to finish, everywhere Juventus' players looked there seemed to be someone in a red and white shirt hurtling towards them.
Juventus will have anticipated what was coming, yet still the ferocity of Ajax's opening assault stunned them, rocking them back.
Even the calmest heads can become muddled under extreme pressure and, for 15 minutes, Ajax tore into Juventus, throwing themselves forward in packs, hunting and pressing, looking to force an early mistake, to catch the Italian champions before they had got their match bearings.
You could see the impact. Juventus players rushed and stressed, Rodrigo Bentancur kicking a free-kick straight out of play as he tried to play it square, Joao Cancelo dribbling the ball out under harassment from David Neres.
Juventus, though, have removed many a sting from an angry tail and held firm, the defence stretched but unbroken. Ajax dominated territory but they could not pass their way through.
Neres hit the side-netting, Donny van de Beek fell away as he tried to steer a shot beyond Wojciech Szczesny. It was let off for Juventus.
Ajax's best effort belonged to Hakim Ziyech, the Morocco international, bending a shot which was heading for the top corner.
Szczesny saw it cleanly, though, and was able to adjust his feet to tip it over the bar.
Juventus began to look a little more comfortable. They knew Ajax would not be able to continue at such a pace for long. They waited, bided their time and in the final seconds before the halftime whistle was blown, they took the lead.
The warning signs were there, Miralem Pjanic going close, Cristiano Ronaldo testing the goalkeeper with his feet one moment, beating him with his head the next, charging through the middle of the Ajax defence with a perfectly timed run to meet Cancelo's cross.
Juventus will have felt in control at the interval. They were mistaken. Ajax were not deflated and they were level within seconds of the restart, Neres twisting and feinting his way into the area and between wrong-footed defenders and then bending a shot into the far corner.
- Telegraph Group Ltd