Mystery surrounds the fitness of Alex de Minaur as he prepares for the biggest match of his career.
The Australian No.1 faces a Wimbledon Centre Court showdown with seven-times champ Novak Djokovic, with a debut grand slam semi-final place at stake.
But the 25-year-old is sweating on a hip injury incurred while winning the final point of his fourth round match against Arthur Fils.