Olympians Christian Sprenger and Marieke Guerher have opened up Australia's Swimming World Cup campaign with three gold medals in the first round of the seven-meet series in Brazil.

Sprenger landed the breaststroke double on day one, opening his account with a personal best time of 26.89 in the 50m final, just a touch outside Beijing team mate Brenton Rickard's Australian Short Course record of 26.62.

He was back in the water later in the day to easily account for the field in the 200m breaststroke, recording a comfortable time of 2 mins 07.58.

Guehrer, the Athens Olympic backstroker, is on the comeback trail in butterfly and freestyle, winning the 100m butterfly in 57.51, outside her best but too good for American Brooke Bishop in 59.13 and South Africa's Mandy Loots in 59.18.

She later finished second to Bishop in the 50 metres freestyle, clocking 24.73 to Bishops 24.66 and ahead of nine-time FINA World Short Course Champion and 2002 world champion in this event, Swede Therese Alshammar in 24.96.

Australia's Kyle Richardson won two bronze medals, behind Brazil's Olympic 50m freestyle champion, Cesar Cielo and Swedish Olympic finalist Stefan Nystrand in the 100m freestyle, clocking 48.24 and behind Brazilian pair Thiago Pereira and Henrique Rodrigues in the 100m individual medley in 54.66.

Beijing backstroker Sophie Edington was Australia's only other medallist, winning silver to Brazil's Fabiola Molina in the 50 metres backstroke, 27.60 to 27.79.

The World Cup comes to the Sydney Olympic Park Aquatic Centre on October 25 and 26 and will feature a host of Australian stars, including Beijing Olympic golden girls Bronte Barratt and Emily Seebohm and Tunisia's 1500m freestyle Olympic gold medallist Oussama Mellouli.