#4 Hit: Idrissa Gueye
Marco Verratti was probably PSG's best performer in the first leg, so knowing he was sidelined through yellow card suspension for this return fixture, Dortmund would have been eagerly anticipating a repeat performance from their central midfield duo - Can and Witsel.
Idrissa Gueye had other ideas, however. In one of his best performances of the campaign, the 30-year-old asserted quality in abundance with forceful tackles from the early exchanges and it set the tone as he bossed the midfield in the Italian's absence.
Protecting a PSG backline without influential captain Thiago Silva is never an easy task, but the Senegal international did precisely that - while freeing up Leandro Paredes to get forward more than you'd expect, considering they were a central pair in Tuchel's 4-2-2-2 formation.
Distributing the ball well, he was confident and Dortmund simply couldn't cope against a player who swept in-front of the backline beautifully and worked diligently under pressure. It should come as no surprise that Gueye recorded a game-high 8 tackles, with 89% pass success (50 complete) while making three clearances, a blocked shot and interception too.