Neither the Davis Cup nor the Fed Cup will take place this year after postponements until 2021 were announced.
The Davis Cup is set to be held in Madrid in November but Gerard Pique is unsure if it will go ahead.
Bob and Mike Bryan helped the United States book a spot at the 2020 Davis Cup Finals.
China have been forced to abandon their Davis Cup campaign, with coronavirus-linked travel limitations seeing a tie with Romania cancelled.
Having two "world cups" in the space of little more than a month is confusing, says Davis Cup champion and ATP Cup finalist Rafael Nadal.
Former world number one Andy Murray has revealed how a "mild" groin injury forced him to sit out much of the Davis Cup.
Spain's Davis Cup win in Madrid will never be forgotten by world number one Rafael Nadal.
Spain ended an eight-year wait to lift the Davis Cup by beating Canada, Roberto Bautista Agut and Rafael Nadal getting the job done.
Rafael Nadal and Feliciano Lopez produced doubles heroics against a resilient British pair as Spain reached the Davis Cup final in Madrid.
A pulsating tie went the way of Canada, who defeated Russia to ensure they will contest the Davis Cup final for the first time.