Edmund had beaten Seppi before, on the indoor courts of Antwerp back in 2016, but found himself a set and a break down with more than an hour of tennis gone.
However, the 23-year-old showed remarkable composure in only his second Grand Slam last-16 match to fight back, breaking back immediately and going on to pinch the second set when a tie-break seemed inevitable.
From that point onwards, the sole British representative in the men’s singles never seemed to look back, cruising through the third and fourth sets and relying on his serve to get him out of trouble when Seppi’s clean ball-striking left him break points down.
In all, Edmund produced 25 aces and won 80 per cent of points behind his first serve. When he faces either Grigor Dimitrov or Nick Kyrgios in the quarter-finals, he will need to repeat that form and more if he is to pull off an almighty upset.
“It’s a good feeling [to make a first Grand Slam quarter-final],” Edmund said.
“It was a really interesting match.
“Although it was quite a close a first set, I didn’t feel I got off to the best start. He was hitting the ball very clean and dictating a lot points.
“I really had to shift the momentum but I found once I broke him in that last game of the second set, I took the momentum of the match.”
Edmund has, inevitably, found himself plagued with questions about Andy Murray’s absence, with the former world No 1 laid up at home in the UK after hip surgery.
But the British No 2 insists flying the flag has not added any extra pressure to his campaign.
“It’s more of a shame that Andy isn’t here,” Edmund added.
“You play for your nation but you’re here playing for yourself and nothing changes in terms of your preparations and process.
“Hopefully we’ll have more British here in the future but for me just personally I’m very happy to get through.”