Andy Murray, Rafael Nadal and Novak Djokovic have backed footballer Gerard Pique's plans for a tennis 'World Cup' which could rival the Davis Cup.
Barcelona's Pique reportedly met ATP officials this week to discuss a 16-team knockout competition played in one venue over 10 days.
World number one Murray said: "If it comes off, I think it would be a very, very good thing for tennis."
The current Davis Cup format is played over four weekends throughout the year.
Murray, Nadal and Djokovic have all led their nations to Davis Cup glory but have also opted out of playing in the tournament in order to focus on Grand Slam preparations.