Alex de Minaur's growing reputation continues to rise with the 19-year-old Australian knocking French Open semi-finalist Marco Cecchinato out of Wimbledon.
De Minaur, who reached the junior final at The All England two years ago, prevailed 6-4 6-7 (8-6) 7-6 (7-5) 6-4 in an absorbing three-hour slugfest on Court 17.
The Sydneysider, who is mentored by former world No.1 Lleyton Hewitt, showed all the fighting qualities of the 2002 Wimbledon champion to chalk up his first-ever grand slam win.
He'll now face Pierre-Hugues Herbert in the second round and victory over the Frenchman could potentially set up a third-round match-up with world No.1 Rafael Nadal.
Herbert beat Germany's Mischa Zverev 6-4 6-3 6-4 to seal his spot in the second round.
After a tight first set, de Minaur broke at 4-4 and served out to take the lead.
However, he then squandered two set points in the second set as the world No.29 hit back to level the match.
De Minaur took a tense third set after saving a set point in the tiebreak, prompting a Hewitt-style roar of "come on."
He then jumped into a 2-0 lead in the fourth only for the Italian to level the score, before the youngster edged his nose in front again in a tense game that contained three deuces.
De Minaur then held his nerve to see out the win, his first over a top-30- opponent since beating Milos Raonic in Brisbane last January.
"It was a dream come true to play at Wimbledon and it couldn't have gone any better," de Minaur said.
"There were so many nerves and mixed emotions going through the match. It was good to be able to finally let go.
"There were so many things going through my head and when I was able to finish it off I was able to release all that nervous energy and forget how tired I was.
"It's a memory I will cherish for a very long time."