Gill Gross breaks down two high-billing quarterfinals from Friday's action at the Monte Carlo country club. Jannik Sinner faced Holger Rune in a rematch from last year's semifinal at the event. Plus, Novak Djokovic took on Alex De Minaur looking to reverse the result from this year's United Cup. At the end, we'll preview the semifinal lineup of Stefanos Tsitsipas vs. Jannik Sinner and Novak Djokovic vs. Casper Ruud.