Alex de Minaur is trusting in his staying power, his concentration levels and determination to make his opponents sweat for every point as it gets down to "crunch time" at Wimbledon.
But Flavio Cobolli, 'Demon's' dangerous and flamboyant last-16 opponent who's on a high after a breakthrough run to the French Open final, is taking inspiration from an Italian pal, warning he's ready for another marathon slog on the SW19 lawns.
No.5 seed de Minaur has enjoyed a straightforward run to the fourth round so far, having dropped just one set and been on court for less than six-and-a-half hours, compared to the 10-and-a-half hours it's taken the 9th seeded Italian to battle there.