Alex de Minaur defeated Daniil Medvedev in four sets on Monday at Roland Garros.
The Australian tennis champion credits a 14-year-old 'miracle' superfan, Paul, for his win.
What happened?
Alex de Minaur was impressed by Paul's non-stop cheering during his match against Jan-Lennard Struff on Saturday.
He later found Paul through social media and invited him to his next match.
Why it matters for Alex de Minaur
Paul's support seemed to give Alex de Minaur an extra boost, as he mentioned the youngster's "distinctive" voice after the match.
Alex de Minaur even signed Paul's tennis cap and gave him a towel.
What comes next?
Alex de Minaur has invited Paul to his quarter-final match and plans to spend time with him during his practice day.
Paul has become a celebrity in his own right, with fans and media praising the heartwarming relationship between him and Alex de Minaur.
The tennis world has been blown away by their story, with many calling it the most wholesome moment of the tournament.
Bastien Fachan, a popular tennis freelancer, tweeted about the pair, saying they are the "most wholesome story" of Roland-Garros.
Alex de Minaur's win against Daniil Medvedev was a significant upset, with the Australian coming out on top in four sets.
The match was played on the second showcourt at Roland Garros, with Paul's cheering clearly audible throughout.
As Alex de Minaur moves on to the quarter-finals, he will undoubtedly have Paul's support behind him.
The youngster has already made a big impact on the tennis champion, and their friendship is sure to continue.
The date of the match was Monday, and Alex de Minaur finished with a win in four sets.
He will face his next opponent in the quarter-finals, with Paul likely to be in attendance.
Alex de Minaur's ranking and seed have not been affected by this win, but his confidence has surely been boosted.
He will look to continue his winning streak in the quarter-finals, with Paul's support cheering him on.