The Serbian went on a nine-game run and booked a quarterfinal spot with a 6-2, 6-2 rout of Lorenzo Musetti.

Despite having not played an official match since 2022, "The Last Challenge" in Buenos Aires was a send-off for del Potro on his own terms.

As he gets ready to play Novak Djokovic in an exhibition to "say goodbye" this week, the Argentine is lifting the lid on just how much his career-ending knee problem has disrupted his life.