Barcelona and Borussia Dortmund will need to defy history if they are to make it to the semi-finals on Wednesday night ... not that it has always stopped the Blaugrana.
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Here is something that could further affirm Juventus and Monaco as they approach their UEFA Champions League quarter-final second legs with decent first-leg leads.
We looked at every past first leg in the European Cup/UEFA Champions League, UEFA Cup/UEFA Europa League and European/UEFA Cup Winners' Cup with an identical scoreline to the current quarter-final ties and noted which teams went though.
Borussia Dortmund and Barcelona have long odds against them. But that's not always stopped Barcelona ...
Barcelona v Juventus (0-3)
Home side in second leg through: 26 (5.6%)
Away side in second leg through: 441 (94.4%)
• In the round of 16, Barcelona actually had a 0% chance against Paris Saint-Germain by each reckoning as all 58 previous teams to lose a first leg 4-0 away had been knocked out.
Monaco v Borussia Dortmund (3-2)
Home side in second leg through: 97 (97%)
Away side in second leg through: 3 (3%)