How does it work?Thirty-six sides entered into the new "league phase" and now just four remain with a month-and-a-half to go in the UCL campaign.Barcelona, Paris Saint-Germain, Arsenal, and Inter Milan are through to the semifinals,

The fear that Lamine Yamal provokes in defenders when he gets the ball on Barcelona's right flank has inevitably conjured up comparisons to a young Lionel Messi.

One team, Barcelona rejuvenated by Flick and fueled by a title victory over bitter foes Real Madrid. The other, an Inter Milan that, despite a recent trouncing in the Coppa Italia, still has the audacity to silence any stadium.