Norwegian Ruud estimates players' prize money "represents on average 15 percent of the revenue" made during the Australian Open, Roland Garros, Wimbledon and the US Open.

"As a player, I don't feel like it's fair," Ruud told AFP on the sidelines of an Ultimate Tennis Showdown (UTS) event in the southern French city of Nimes.

"If you compare with other major sports around the world, NFL, MLB, NBA, they are closer to 50 percent revenue sharing."

Former US and French Open runner up Ruud's comments come after it was revealed several top 20 players sent a letter to Grand Slam organisers, requesting a more favourable revenue distribution.

"We responded by proposing a direct, open, and constructive meeting, starting at the Madrid Open (April 22-May 4), at Roland Garros (May 25-June 8), or at any other convenient time," the FFT source added.