"The creation of the World Cup of Tennis finals is at the heart of a series of reforms that represent the most significant changes in the history of Davis Cup and Fed Cup," ITF President David Haggerty said in a federation statement.
"Change is needed to ensure that we maximise the full potential of these iconic and historic competitions."
The ITF statement said combined finals would "unlock new revenues for tennis development, increased prize money and player bonus pool".
The plan will be part of a wide-ranging reform package to be submitted for approval at the ITF's annual general meeting in Ho Chi Minh City, Vietnam in August.
Geneva was chosen by the ITF Board of Directors at their meeting in Frankfurt on Tuesday ahead of bids from Copenhagen, Istanbul, Miami, Turin and Wuhan.
(Reporting by Hardik Vyas in Bengaluru; editing by Mark Heinrich)
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