The unique mixed teams Hopman Cup is looking for a new host venue after being replaced in Perth, Australia by a new men-only ATP World Team Cup.
Perth, Sydney and Brisbane will host the new event, which takes place from 3 January, before the Australian Open.
This year's 31st Hopman Cup saw tennis legends Roger Federer of Switzerland and American Serena Williams play against each other for the first time.
But event founder Paul McNamee now has "concerns" about its future.
The four-time doubles Grand Slam champion added: "My immediate feeling is sadness that it's not going to be there [in Perth] anymore.