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.

Arsene Wenger believes Arsenal ’s defensive strength could prove the key in their Champions League semi-final against PSG. The Gunners are bidding to reach the final of the competition for the first time since 2006, when Arsene Wenger’s side were narrowly beaten by Barcelona in Paris.