Cristiano Ronaldo might often be regarded as a worst nightmare for any Champions League opponent - but that quite literally is the case for Atletico Madrid.
A five-time winner of the marquee European competition, Ronaldo has also scored a record 140 goals from his 181 appearances and counting.
Of course, the Portuguese sensation first won 'the big one' during his first memorable spell at Old Trafford.
Having touched back down in the Premier League this summer, the 36-year-old former Real Madrid superstar has netted 13 times already this season - and the controversial Champions League redraw has seen him pitted against a familiar foe in the reigning La Liga champions.
Manchester United were at the centre of that fiasco when footage showed their ball was not included in a pot for potential last 16 opponents for Atletico.
They were initially drawn alongside Villarreal but, having progressed from the same group, the first legitimate draw actually saw Ronaldo and co pitted against Lionel Messi and big-spending Paris Saint-Germain.
However, that glaring error was soon flagged up, prompting a redraw.
United are now set to take on Diego Simeone's men over two legs in February and March next year - but why are the Spaniards, exactly, facing a nightmare scenario? You guessed it, that's all down to Ronaldo.
Boasting an incredibly rich history in the competition, Real - and the five-time Ballon d'Or winner - were victorious over their city rivals on FIVE separate occasions between 2014 and 2019.
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First beating them in the 2014 final, that result was replaced two years later in the 2016 showpiece.
Not only that, Real got the better of Atletico in the 2015 quarter-final, the 2017 semi-final and at the last-16 stage shortly before Ronaldo's departure for Juventus in 2019. No doubt happy to see the back of him then, can Atletico and their charismatic manager Simeone make it sixth-time lucky at United's expense?
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