RIO DE JANEIRO (AP) The days are numbered for clay-court tennis in Latin America.
The clay-court circuit lost a major event several years ago when the Mexican Open in Acapulco switched to hardcourts. The tournament is on this week.
The Rio Open, which ended on Sunday, is likely to be next. And it could signal the end of several smaller clay-court tournaments in Quito, Buenos Aires and Sao Paulo.
The so-called ''Latin American clay-court swing'' comes in February and early March - just after the Australian Open on hardcourts, and just before Acapulco and two well-established hard-court events in Indian Wells, California, and Miami.
''We're in the middle of nowhere,'' Rio Open tournament director Luiz Carvalho told The Associated Press.
The driving force for change is the new tennis arena built in Rio for last year's Olympic Games. The $50 million venue in suburban Barra da Tijuca is vacant, being run by Brazil's federal government, and needs events. And it's built for hardcourts, not clay.
Carvalho speaks cautiously, but acknowledges he's in talks with ATP President Chris Kermode and the other South American tournament directors about making the move.
''The concept of moving to hard (courts) we all agree,'' said Carvalho, speaking for the other South American tournaments. Carvalho's long-term goal is to upgrade Rio to what the ATP calls a 1,000-level event - like Indian Wells, Miami, and a handful of others across North America, Europe and Asia.
The Latin American clay-court circuit struggles to draw top players. This year, Rio attracted No. 5 Kei Nishikori and No. 9 Dominic Thiem, who eventually won the event.
By comparison, Acapulco has four players in the top 10 this week - and seven in the top 20 - including Novak Djokovic and Rafael Nadal, the king of clay who has won a record nine French Open titles on the surface at Roland Garros. It also had No.4 Milos Raonic, who pulled out with an injury.
Nadal chose to play in Mexico this season instead of Rio, where has been the marquee draw the last several years.
Carvalho said the ''ATP doesn't have to be frozen'' and needs to change to adapt to younger players.
Thiem, who has won six of his eight singles titles on clay, sees the change coming.
There are still a run of clay-court events in Europe leading up to the French Open, including Masters 1,000 tournaments in Monte-Carlo, Madrid and Rome. After the French, there's a condensed grass court stretch of tournaments ahead of Wimbledon before the tour predominantly reverts to hardcourts.
The Rio Open has been played for four years at a temporary clay-court venue set up at Rio's Jockey Club, the city's horse racing track. It is located in the city's most upscale area, and a move to suburban Barra would dislodge the event from the heart of the city.
The event is a joint venture between IMG, the marketing company, and Mubadala, a state-owned investment arm of the United Arab Emirates.
The International Tennis Federation, the world-governing body, wants the Olympic venue used. And the sooner the better.
''The ITF retains the hope that the venue will see world-class events in the future,'' the ITF said in a statement to AP.
The ATP must approve any change, and it's saying little publicly. In an email to the AP it said the 2019 calendar might be a logical place to make any changes, though Carvalho suggested it might come sooner.
But the first move means getting off the clay.