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.
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%)