4 key battles that will decide Champions League quarter-final second legs

This is it, people. The clocks have gone forward, evenings are lighter, and the Champions League campaign has reached its business end.

Everything is still to play for heading into the second legs of all four quarter-finals and it remains ever so difficult to pick a favourite to go all the way.

How will these second legs be decided? Let's look at four key battles that will determine their outcome and decide this year's Champions League final four.

This is likely Kylian Mbappe's last chance to win a first-ever Champions League for hometown club Paris Saint-Germain ahead of his expected departure this summer.

During last week's 3-2 loss at home to Barcelona, he sure as hell didn't look like a man intent on delivering an historic European Cup before packing his belongings and heading to pastures new.

That was, in part, due to the heroic and dogged defending of Jules Kounde and Ronald Araujo on the right-hand side of Barca's defence, doubling up on Mbappe and limiting his chances.

If Mbappe is to sign off from PSG in a blaze of European glory, he needs to find a way to break through that blockade.

Sebastien Haller is in line to miss Borussia Dortmund's second leg with Atletico Madrid having picked up an injury at the weekend.

They will instead have to rely upon veteran striker Niclas Fullkrug — a target man of extreme Bundesliga heritage.

Maybe that's the best way to penetrate Atletico's elite deep block is to throw a man made of bricks at it. Maybe they'll wilt under that sort of aerial bombardment in the Signal Iduna Park cauldron. Hey, it's worth a shot if Dortmund are to overturn a 2-1 deficit.

Harry Kane has scored 15 goals in his 20 matches against Arsenal, registering his latest from the penalty spot in Bayern Munich's 2-2