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|Novak Djokovic led Serbia to victory in the ATP Cup last month. AFP/William WEST|
Djokovic, who recently won his eighth Australian Open title and led Serbia to the ATP Cup trophy last month, made his plea prior to starting this week as top seed at the Aviation Club.
"In my opinion, they have to merge," the world number one said of the two competitions, which are held less than two months apart at the end of one season and the start of the next and he believes should become "one super cup".
"That's necessary because for me personally it will be very difficult to play every single year both competitions, so I'm going to have to choose," said the 32-year-old, president of the ATP Player Council.
"I don't think this is (a) sustainable model for our tennis."
Djokovic dropped major hints that the Davis Cup, which has eliminated the classic home-and-away format in favour an 18-team Finals held over a week in Madrid, needs the most repair work.
"What I don't like with Davis Cup is you don't have a possibility to play at home any more," he said. "ATP Cup was like playing at home for us (Serbia) because we had a tremendous support in Australia."
But Djokovic also cautioned that the ATP Cup, which will stay in Australia for the forseeable future, has its own drawbacks.
"It's (to be held) 10 years in Australia. It's really difficult to call these competitions World Cups because is there no 'world' if you keep it in one place for 10 years.
"For 99 per cent of the nations, they will not have the possibility for many, many years to host a tie at home."