A big puff of the cheeks from Andrey Rublev's coach, after the Russian collapses to the floor in a mixture of exhaustion, relief and celebration.
The fifth seed eventually wins a final-set tie-break 10-6 to defeat Brazilian Thiago Seyboth Wild 7-5 6-4 3-6 4-6 7-6 (10-6) after three hours and 42 minutes.
"For sure I will not forget this match, Rublev said in his on-court interview.
"Thiago is a super dangerous player, super talented. He hits so hard and so clean, it is so hard to beat him. He was serving so hard, not many double-faults, he could hit a winner from any position.