Former tennis great Billie Jean King has warned the men's game that it will have to "wake up" when Roger Federer and Rafael Nadal retire, as she wishes the ATP and the WTA could form one joint organisation.
King was the first female player to win Wimbledon in the Open era and has long fought for equality in tennis, with her Battle of the Sexes II triumph over Bobby Riggs in 1973 boosting the women's game.
But the American, a 12-time grand slam champion, remains disappointed that the ATP, the men's association, has not teamed up with the women's WTA.
King, 74, believes a joint organisation would make better business sense, but she claims men's tennis is unable to recognise this in an era where, in Federer, Nadal, Novak Djokovic and Andy Murray, there are four genuine greats.
"My plan A was always to have the men and women together, period," she told The Observer. "Because it's not just what we can do on the court, but also off the court to make the world a better place.
"We also have more power together than divided. It's simple. We're so much more powerful together.
"If you are in business and you own a tournament where the men and women are together, and you want to sell your tournament, it's worth so much more than having a single-gender tournament. It's just better business.
"I don't see it [happening]. The guys don't want to share. They think we're in the way, 'Get out of here.' They don't think we have any clout.
"I think they'll have to wake up again because they've had a golden era, especially with Federer and Nadal and Djokovic and Murray. Are you kidding - the four of them? Amazing.
"That's not going to happen every generation. We'll still have one or two maybe, a lot of young guys coming up who are interesting, but they're not Federer or Nadal."
|Rogic, Kruse to miss Socceroos´ Lebanon friendly|
|Joerger has Kings´ ´full support´, says GM Divac|
|England seal series win over Sri Lanka|
|Butler´s heroics spoil Walker´s 60-point game as 76ers beat Hornets|
|He´s an honest guy – Djokovic defends Zverev after Finals controversy|
|Bonucci boos a ´mistake´ by fans, says Mancini|
|Ronaldo still part of Portugal squad – Santos|
|Santos satisfied as Portugal reach Nations League Finals|
|Howell holds onto RSM Classic lead|
|McLeish optimistic as Scotland zero in on Nations League promotion|
|Luis Enrique rejects criticism of Spain star De Gea|
|Schmidt dismisses Hansen´s Ireland World Cup favourites claim as ´banter´|
|There are always imbeciles – Bonucci hits back at fans after frosty San Siro reception|
|Portugal draw ´a step forward´ despite poor finishing – Mancini|
|Ireland were just too good - Read|
|Thomas at the double as France end losing streak|
|Albania 0 Scotland 4: Forrest double sets up promotion showdown|
|Italy 0 Portugal 0: European champions outplayed but secure Finals spot|
|Sensational Djokovic marches into final|
|Stander lauds Ireland´s ´unreal´ defence as All Blacks are thwarted|
|Dazzling Ireland claim historic All Blacks scalp in Dublin|
|Federer unimpressed with Zverev boos|
|Let´s get it on! Cheika relishing England clash|
|Croatia coach Dalic to speak with Lovren over Ramos remarks|
|Xhaka puts improved form down to ´freak´ Emery|
|De Gea not lacking confidence, says Spain´s Saul|
|Jordan goalkeeper scores from own penalty area in friendly against India|
|Pollard leads Springboks to Murrayfield victory|
|Fired-up Japan taught England a great lesson - Jones|
|Sarries leave it late to down Sale, Bath and Saints win|
|O´Shea fumes at disallowed Italy try|
|Southgate welcomes England selection quandary|
|Reaching Rooney´s England goals record ´definitely possible´ – Kane|
|Debut try for Cokanasiga as England rally to avoid Japan upset|
|Wembley will galvanise ´tired´ Croatia, insists Dalic|
|Zverev apologises for tie-break controversy amid O2 Arena heckles|
|Marquez happy with fifth after damaging shoulder in Valencia|
|Wales crush Tonga in Cardiff|
|Germany should keep faith in old guard - Bierhoff|
|Injured Lukaku to miss Belgium´s Nations League decider|
|Zverev knocks out Federer to reach maiden ATP Finals showpiece|
|Koroibete double maintains Australia´s 100 per cent record against Italy|
|Juventus´ Khedira sprains ankle in training|
|Van Dijk: Ramos is not my type of defender|
|Vinales grabs Valencia pole as Marquez crashes|
|I don´t deserve Ballon d´Or, Mbappe does – Hazard|
|Reed and Willett share lead in Dubai|
|Romagnoli joins long AC Milan injury list|
|Williamson steadies Black Caps after Boult heroics|
|Griezmann targets swift French response against Uruguay|
|Havertz´s future lies with Bayer Leverkusen – sporting director Boldt|
|Socceroos boss Arnold excited for future|
|South Africa triumph on Gold Coast in truncated T20 clash|
|Germany without Draxler for Netherlands game|
|Barcelona confirm Rakitic hamstring injury|
|Rain halts England´s post-tea flourish|
|Australia 1 South Korea 1: Luongo seals late draw for Socceroos|
|Irving thrives on ´peace´ of being in the zone|
|Lloris admits France could have lost by more|
|Dybala impressed by Argentina´s improved spirit|
|Arsenal chief confirms Super League talks|
|Hooker knocks out Saucedo to retain WBO strap|
|NBA wrap: Kyrie Irving sizzles as Celtics beat Raptors in overtime|
|Jimmy Butler aims dig at Timberwolves following 76ers home debut|
|Koeman surprised by dominant Netherlands|
|Southgate rallies England ahead of Nations League decider|
|Chile 2 Costa Rica 3: Waston brace sinks La Roja|
|Tite inspired by Guardiola´s City|
|Argentina 2 Mexico 0: Funes Mori´s header helps to sink El Tri|
|Lovren ready for ´fiery´ England clash|