World number 204 Valentin Vacherot upset his cousin Arthur Rinderknech to win his first ATP title at the Shanghai Masters.

Monaco’s Vacherot fought back from a set down to win 4-6 6-3 6-3 against the world number 54 to become the lowest-ranked ATP Masters 1000 champion since the series began in 1990.

The 26-year-old sealed the success with a searing forehand down the line and, after hugging Rinderknech at the net, sprinted off court and up to one of the boxes to celebrate with his coach and family.

Vacherot then continued the winner’s tradition of writing a message on one of the courtside cameras, writing “Grandpa and Grandma would be proud”.

Both players struggled to hold back tears during their post-match speeches on court.

“It is unreal what just happened – I have no idea what is happening right now. I am not even dreaming, it is just crazy,” said Vacherot.

“There has to be one loser but I think there are two winners today. One family that won and I think for the sport of tennis, the story is unreal.

Frenchman Rinderknech added: “Valentin, you gave everything I am so happy for you. Two cousins are stronger than one.”