Rio's Olympic committee says volleyball and soccer are the most popular sports for fans seeking tickets for the 2016 Games.
With two days left until the end of the first phase of sales, Rio organisers said other sports with a high number of requests are swimming, basketball and athletics.
Brazilians have until April 30 to make their requests online, and a random draw in June will determine who gets the tickets.
Nearly 7.5 million tickets are available, with about 70 per cent reserved for Brazilians.
International fans can buy tickets through an official reseller in their own country.
Ticket prices start at about $12 for Brazilians, who can pay for them in up to five instalments.
A second sales phase is scheduled later in the year.
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