The impressive Yildiz then burst through the middle and unleashed a fierce effort which deflected off Aurelien Tchouameni and flew wide.
The Turin team, beaten 5-2 by Manchester City in their final group game, were moving the ball around with confidence, but Real grew into the contest, and they went close when Jude Bellingham forced a save out of Michele Di Gregorio from close range.
Federico Valverde then tested the Juve goalkeeper from long range, and Trent Alexander-Arnold whipped a low ball across the face of the goal as Madrid finished the half strongly.
The interval did nothing to alter the momentum of the game with Real creating several chances – Bellingham laid off to Valverde, whose sweetly struck shot was just wide and then Bellingham himself brought another good save out of Di Gregorio with a shot from the edge of the box.
Dean Huijsen’s rocketing drive was parried out by the busy goalkeeper as Real laid siege to the Juventus goal, and it was no surprise when the breakthrough finally arrived.
‘We had to be patient’
Alexander-Arnold floated in a cross from the right, which Gonzalo met with a perfectly timed header for his third goal in four games in the tournament.
Juve responded with Portuguese winger Francisco Conceicao bringing Courtois into action from a low shot the Belgian shot-stopper did well to get down to.
But Real wanted to finish the contest off, and Valverde tested Di Gregorio’s reactions with an overhead kick before Alonso decided to introduce Mbappe to the delight of the 62,149 crowd.
Juve’s belief remained, however, and Nicolas Gonzalez flashed a 25-yard drive just wide.
At the other end, Real’s Turkish midfielder Arda Guler saw his crisp shot kept out by the feet of Di Gregorio, but the one goal was enough.
Alonso was pleased with his team’s performance, including that of Gonzalo, who he had compared to former Real great Raul, but also suggested that Mbappe might be ready for a bigger contribution in the next game.
“I think day by day he will be better, and from now until the quarter-finals on Saturday, in 3-4 days, he will be better. We will keep watching him. I talk to him every day about how he’s feeling, and well, I think he will be much better for the quarters,” he said.
Alonso said he was satisfied to see Real produce the necessary grit to grind out the result in the second half.
“We had to be patient, we had to mature into the game. We didn’t score that second goal to give ourselves a bit more margin. But it is a knockout game and about it’s competing in a tie. With the players and myself, you know you have to grit your teeth and do what you have to do. And in the end, we had to hold on a bit, and I’m happy about that too.”
Juve boss Tudor said his team became exhausted as the game developed.
“In the end, there were 10 of them asking to be substituted, obviously you can’t do that but there was an incredible tiredness,” he said, adding there were three main reasons.
“There is the tension of the game which burns energy, but then there is the heat and humidity,” he said, also noting they were at the end of a long season.
-Agence France-Presse
