A series of rule changes will be trialled at the Next Gen ATP Finals in Milan in November ©ATP

A series of rule changes will be trialled by the Association of Tennis Professionals (ATP) at the Next Gen ATP Finals in Milan later this year.

The season-ending tournament will see the world’s top players aged 21 and under competing for total prize money of $1.275 million (£980,000/€1.1 million) from November 7 to 11 at Fiera Milano.

The rule changes are aimed at creating a "high-tempo, cutting-edge and television-friendly product" and are geared towards attracting new and younger fans into the sport, while retaining the existing fan base.

Changes include a shorter format with first to four games sets within a best of five set match.

There will also be a shorter warm-up with play to start within five minutes of the second player entering the court.

A shot clock will be used between points to ensure strict regulation of the 25 second rule, as well as during set breaks, medical time-outs, and the five-minute countdown from the player walk-on to the first point of the match.

There will also be a no-let rule applied to serves, bringing an "additional element of unpredictability at the start of points".

Players are limited to one medical time out per match and will be able to communicate with coaches at certain points in the match, which are yet to be determined.

The changes have already received the backing of world number two Novak Djokovic.

“In terms of introducing new things and new rules to the tennis, I think everything is evolving in life and sport does, too," said the Serbian.

"Tennis has to be open-minded for these kind of new potential changes.”

ATP President Chris Kermode said he is
ATP President Chris Kermode said he is "excited to be bringing something new to the table" ©Getty Images

In addition, a ‘free movement’ policy will be applied to the crowd, except behind the baselines, throughout the tournament.

The policy will enable fans to move freely in and out of the stadium during matches, providing a relaxed fan-friendly atmosphere and ensuring fans are not restricted entry into the stadium at any time.

The ATP claims it carried out extensive market research and fan surveys across more than 13 different markets, prior to determining which rule changes to trial at the inaugural tournament.

“We’re excited to be bringing something new to the table with this event," said ATP President and executive chairman, Chris Kermode.

"The sports and entertainment landscape is changing rapidly, as are the ways in which fans are consuming our sport.

"This event is not only about the next generation of players, but also about the next generation of fans.

"We’ve created this new tournament precisely to allow us to look at some potential new elements, in a high-profile environment.

"We remain acutely aware of the traditions in our sport, and we will be sure to safeguard the integrity of our product when assessing if any changes should eventually be carried forward onto regular ATP World Tour events in the future.”