But it remains advantage Juve, with the away goal handing them the edge going into next week's return leg in Italy.
On Wednesday night, the second batch of Champions League quarter-final second legs took place.
"The celebrations can be postponed because on Tuesday we have an important game that could give us the qualification for the semi-finals".
Ronaldo, 34, made his Champions League debut in 2003 for United, but didn't find the net in the competition until 10 April 2007, when he scored twice in a 7-1 thrashing of Roma.
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The Italian, who is looking to guide his team to their first Champions League trophy since 1996, said: "His timing and movement are different to everyone else's, there's nothing you can do about it".
"Ajax have great qualities".
This result allows them to maintain hope ahead of the return, even if they might feel they should have won here.
Ajax captain Matthijs de Ligt, who is heavily rumoured to make a blockbuster move in the summer, also called on his teammates not to be overawed in Turin.
"Obviously the Sampdoria game was a confidence boost for us all, but for now we need to keep doing what we're doing", said Ranieri. If we play the way we did in Madrid, with a lot of courage, then we have a big chance of winning.
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That means the victor of next season's Eredivisie is nearly certainly guaranteed an automatic place in the Champions League group stages.
They were caught off guard at the start of the second period, however, as David Neres found the leveller that Ajax's enterprising play deserved.
He played the ball out wide to Joao Cancelo before ghosting into the box and launching himself through the air to send a diving header past Andre Onana.Ronaldo was a doubt before the game because he had been out since March 25 with a hamstring injury sustained on worldwide duty. The Brazilian worldwide capitalised on an error from Joao Cancelo, before curling his effort beyond Wojciech Szczesny.
Ajax immediately went in search of a second and Nicolas Tagliafico fired into the side netting while Neres had the ball in the net again but was clearly offside.
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Azarenka came out the victor in her only previous meeting with Spain's Muguruza, a hard-fought 7-6 (6), 7-6 (4) win on the hard courts in Miami in 2016.