The International Tennis Federation (ITF) and the men's ATP Tour could be involved in a "race against time" to establish rival plans for a new World Cup of Tennis.
The ITF announced its plans in February, in association with the investment group Kosmos, for an 18-team end-of-season event which will crown the Davis Cup champions from 2019.
But the event is very similar to one the ATP is expecting to introduce in Australia in the first week of the season - most probably from 2020.
And according to Britain's Jamie Murray, a member of the ATP Player Council since 2016, there is no room for both events in the schedule.