The Champions League round-of-16 second legs get underway on Tuesday, with Porto and Borussia Dortmund holding the upper hand over Juventus and Sevilla respectively.
Juve s latest bid to bring their domestic dominance to bear on the European stage is hanging by a thread, with Sergio Conceicao s robust side arriving in Turin 2-1 to the good.
If that tie is on a knife edge, Dortmund s task looks slightly more straightforward on paper – their 3-2 first-leg win having come on the road at the Ramon Sanchez Pizjuan.
However, Edin Terzic s side might be wounded by their sapping Klassiker loss to Bayern Munich at the weekend and Sevilla boast formidable European pedigree. Stranger things have definitely happened.
So, to help you navigate the potential madness, we take a closer look at both matches using Opta data.
Juventus (1) v (2) Porto: Ronaldo aiming to break the shackles
On his return to his homeland, Juventus superstar Cristiano Ronaldo found himself unusually frustrated during the first leg.
The five-time Ballon d Or winner managed just one shot – his lowest return in a Champions League knockout match since he failed to register a shot on goal during the second leg of the 2010-11 semi-final between Real Madrid and Barcelona.
