Substitute Javier Pastore scored an opportunist late goal and then set up Edinson Cavani as Paris Saint-Germain won 2-0 at second-tier Niort to reach the French Cup quarterfinals on Wednesday. After Niort’s goalkeeper Artur Desmas went close to equalizing in injury time following a corner, there was just enough time for Pastore to break down the left wing and set up Cavani’s 36th of a prolific season.