Justine Henin and Kim Clijsters aim to play in front of the most tennis fans in history to raise funds for charity.
The Belgian stars will play an exhibition match at Brussels' 40 thousand-capacity King Baudouin Stadium in July.
They aim to beat the 30,472 fans who attended the 1973 "Battle of the Sexes" between Billie Jean King and Bobby Riggs at the Houston Astrodome.
And the fans could be in for a novel experience with organisers considering a half clay-half hardcourt surface.
The 'Best of Belgium' idea, scheduled for July 8th to mark the opening of nation's six-month presidency of the European Union, would bring two of the country's biggest stars, who have both come out of retirement to resume their playing careers.