Rafael Nadal's Spain will host defending champions Croatia in the Davis Cup finals with the 17-time major winner set to be the only member of the sport's big four taking part in the controversially rebooted tournament.
Top-ranked Marin Cilic and other players boarded a special bus straight from the airport, drove into the heart of the capital.
Marin Cilic clinched Croatia's second Davis Cup title as he beat France's Lucas Pouille 7-6(3) 6-3 6-3 to give his side a decisive 3-1 lead in the final at Lille's Stade Pierre Mauroy on Sunday.
Zverev says he will not take part in a revamped Davis Cup finals showpiece event in Spain next November.
A major Davis Cup revamp that would condense the annual global tournament into an 18-team, week-long event will be voted upon Thursday with major tennis leaders divided over the proposal.
In February, ITF announced a massive shake-up of the competition, which will see the formation of an 18-nation World Cup of Tennis Finals played in one location.
The U.S. duo overcame some nervous moments but were able to win key points in the two tiebreakers to secure a victory.
Frenchman Lucas Pouille threatened to boycott the Davis Cup should the International Tennis Federation (ITF) rip up the format and replace it with a one-week World Cup in a single city.
The 31-year-old has not played in the competition since helping five-time winners Spain return to the top tier of world tennis
France punched their ticket to the Davis Cup final when Jo-Wilfried Tsonga beat Dusan Lajovic 2-6 6-2 7-6(5) 6-2 to give the hosts an unassailable 3-1 lead against Serbia
Hosts France took a 2-1 lead over Serbia in their Davis Cup semi-final.