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.

The last four teams standing return to play in the UEFA Champions League this week for the first leg of the semifinals, when some of Europe's top sides will begin to map out their route to the final on May 31 at Munich's Allianz Arena.

Anyone in the UEFA Champions League semifinals can win it. Here's why Arsenal, PSG, Barcelona and Inter Milan will (and why they won't) win it.