One in 4.6 billion: The staggering odds behind the unexpected Shanghai Masters final showdown between Valentin Vacherot and Arthur Rinderknech

One of the most unexpected final showdowns just occurred in the Shanghai Masters, with world number 204 Valentin Vacherot defying the steep and possibly even unrealistic odds against him to defeat Arthur Rinderknech 4-6, 6-3, 6-3 to win the prestigious title.

Between them, the cousins had never even reached a Masters 1000 quarter-final or won an ATP title, with the Frenchman coming the closest in Adelaide back in 2022 when he lost out to Thanasi Kokkinakis.

For Vacherot, he has only competed in one Grand Slam event and three Masters 1000 tournaments, all in his home country of Monaco, where he made the second round once. Even qualifying for the main tournament was seemingly impossible for the 26-year-old, who was not even on the shortlist at first. But thanks to some late dropouts, he was able to compete for a chance to play in Shanghai. Not only he made it to the main draw, but he defeated the likes of Alexander Bublik, Tomas Mahac, Holger Rune, and most incredibly of all 24-time Grand Slam champion Novak Djokovic to confirm a spot in the final.

It was also an extremely challenging route for Rinderknech to bypass on his way to the final, getting the better of two-time US Open semi-finalist Felix Auger-Aliassime, former US Open champion Daniil Medvedev, and world number three Alexander Zverev among a plethora of other standout names.

It could have been absolutely anyone to make this run to the final, but the fact that it not one but two players who do not feature regularly in the business end of tournaments makes it more of a fairytale. Adding to the fact that they are cousins makes it sound like it was scripted for a Hollywood movie. This is reality though, and despite the ridiculously steep odd of it happening, sport has a weird way of making things pan out like they do.

Vacherot became the lowest ranked player since 1999 and the second lowest ranked player ever to reach a Masters 1000 semi-final. He one upped that to become the lowest ranked player to reach a Masters 1000 final. The previous lowest ranked player to win an 1000 event was Borna Coric in Cincinnati back in 2022. He was the world number 152, meaning Vacherot added over 50 places to the new record.

According to a user on Reddit, the chances of him reaching the final was a measly 0.00001875% before a ball was hit. For Rinderknech it was 0.116%, a much more realistic chance for the world number 54 but still super unlikely. When crunching the numbers together, it comes out that both players reaching the final was one in 4.6 billion, quite possibly making it the most unlikely final in tennis ever, especially for this level of competition. These odds make it rarer than such events as stepping on an Olympic podium (1:662,000), getting hit by a meteorite (1:700,000), getting killed by a shark (1:7,000,000) or even winning the largest possible amount of money on the lottery (1:15,000,000).

That is the beauty and unpredictability of sport, with the wildest scenarios now and again popping up and taking the headlines. Vacherot and Rinderknech will most certainly benefit from this, with them now both rising up the rankings which will give them the chance to feature in more big events. Rinderknech will make his maiden appearance in the top 32, finishing the event as the new world number 28. Before the tournament he was 150 places higher than his little cousin, but that gap has been slashed down to 12. It is yet to be seen whether that was a one off, or if they here to stay and compete with the best in the world on a consistent basis.