The technology allows players to track their travel emissions while on tour, understand their emissions profile, and mitigate their impact by purchasing verified carbon credits through ATP climate action partner Gold Standard.

Travel makes up a significant part of athletes' overall carbon emissions and addressing this has become the top environmental priority of the ATP in line with its commitment to the United Nations Sports for Climate Action.

"This initiative means a lot for tennis because tennis is luckily one of the biggest [and] one of the most popular sports in the world," said Austrian player Dominic Thiem.

"But in the same way, also probably one of the sports with the most travelling, with the most flown miles.

"So it's super important for tennis to step up and take the first steps towards a better future."

The app was developed with Infosys which is the digital innovation partner of the ATP Tour.

Developers aim for the app to inspire greener travel on tour and has seen Thiem, Britain's Cameron Norrie, Andrey Rublev of Russia, and Finland's Emil Ruusuvuori pledge to track and mitigate 100 per cent of their tournament travel emissions this year.

"As a tennis player, I have to travel a lot, especially there are a lot of flights per year [over a] long distance, different continents," said Rublev.

"So the Carbon Tracker app is a perfect first step.

"It's important to use this platform in the right way to move in the same direction.

"If you can use your platform and you try to do something with climate and some people listen to you, and they also start to see this way, maybe their friends [will] also listen to them."

The top three players on the in-app leaderboard at the end of the 2023 season will be eligible to win money from a $100,000 (£78,750/€91,850) prize pool.

It will be distributed in the form of donations to environmental sustainability charities of the players' choice.