Rio de Janeiro, Apr 18 (IANS): Brazilian swimmer Larissa Oliveira set a South American record in the 200 metres freestyle to secure a berth at this year's Olympic Games here.

The 23-year-old on Sunday clocked one minute, 57.37 seconds at the Olympic aquatic centre to eclipse the previous record of 1:58.03 set by teammate Manuella Lyrio, reports Xinhua.

The event is serving as both the final Olympic qualifying competition for Brazilian swimmers and an official test event for the newly opened venue.

"I am still in shock. I don't believe it," Oliveira said.

Eight Brazilian swimmers have now qualified for the Olympics, to be held from August 5 to 21.

In the men's 200m butterfly on Sunday, Leonardo de Deus took gold in 1:55.44 minute, the fifth fastest time in the world this year.

In the same event, Kaio Marcio Almeida secured a spot in his fourth Olympic Games.

Monday's schedule was due to feature 50m and 100m freestyle world record holder Cesar Cielo, who is yet to achieve the Olympic qualifying standard for either event.