Sydney: Tennis' innovative new team championship kicks off the men's 2020 season on Friday, with Rafael Nadal and Novak Djokovic among those looking for a winning start ahead of the first Grand Slam of the year.
The ATP Cup will see 24 nations split into six groups across three Australian cities, with eight teams emerging from the round-robin to compete in a knockout phase until one country is left standing.
It is the sport's newest tournament and the third men's team event competing for the hearts and minds, and dollars, of fans, along with a revamped Davis Cup and the annual Laver Cup, which pits Europe against the World.
But it has already suffered setbacks, with major drawcard Roger Federer opting to give it a miss and Andy Murray and Kei Nishikori pulling out injured.
Despite this, world number two Djokovic said the move towards more team tennis was good for a sport best known for the individuality of its global superstars.
Sydney hosts the finals, along with group games, which are also held in Brisbane and Perth with US$15 million in prize money and up to 750 singles and 250 doubles ATP rankings points at stake.
Australian star Nick Kyrgios agrees with Djokovic, believing it will be "an awesome event".
While Federer, Nishikori and Murray are missing, most of the world's top 30 men are playing.
The championship, from January 3-12, will feature two ties each day in the three cities during the round robin, comprising two singles matches then a doubles.
Belgium kick off the Sydney action against Moldova before Britain face Bulgaria. Kyrgios spearheads local hopes for Australia in Brisbane against the Alexander Zverev-led Germany while Greece take on Canada in the same city.
