As Elina Svitolina stepped up to the baseline to contest her second match point 20 minutes after squandering her first, she sprinted on the spot, she furiously swung forehands and backhands in the air and did everything to show that she was ready.
Nearly two hours into her fourth-round battle with Daria Kasatkina, seemingly every exchange had been long, intense and physical, but Svitolina knows that few players can match her physicality.
Moments later Svitolina extended her brilliant comeback as she outlasted Kasatkina, the ninth seed, 6-4, 7-5 in two exhausting sets to reach the quarter-finals of her first grand slam tournament since becoming a mother.
After twice failing to serve out the match in the second set, the world No 192 gave a comprehensive demonstration of her resilience as she recovered to close out the match in two sets.