The duels on the pitch that are likely to decide the result.
Despite both of Tuesday’s Champions League results being 1-1, before the quarter-finals started most thought that Paris Saint-German v Chelsea would be the closest tie.
It seems that the two sides are the most evenly matched of all of those in the last eight and they play their first-leg at the Parc des Princes to get things started.
Here are the key battles that we think could decide who triumphs in the French capital.
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Edinson Cavani v Cesar Azpilicueta
Two players operating out of their comforts zones to some extent, but who have both been impressing despite not being in their preferred positions.
With the presence of Zlatan Ibrahimovic at PSG, club record £54m signing Cavani has been pushed out to the right wing and whilst the Uruguayan doesn’t particularly like it, has still managed to score four European goals in six games.
Similarly Azpilicueta has been switched from right-back to the left by Jose Mourinho and whilst the Spaniard has impressed, will have his work cut out in this match.