Chelsea vs Barcelona, Tottenham vs Juventus
Man City vs Basel, Liverpool vs Porto
Manchester United vs Sevilla
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Well, from an English perspective that Chelsea tie against Barcelona is the tastiest. This is the sixth time those two sides have been drawn against each other in the Champions League knockout stages (plus one time they were in the same group). The overall knockout stage score since the turn of the century is: Barcelona 3 Chelsea 2.

Juventus vs Tottenham
Basel vs Manchester City
Porto vs Liverpool
Sevilla vs Manchester United
Real Madrid vs Paris Saint-Germain
Shakhtar Donetsk vs Roma
Chelsea vs Barcelona
Bayern Munich vs Besiktas