Shanghai Brazilian swim star Cesar Cielo escaped a drugs ban on Thursday after a high-profile case that left him clear to defend his 50m and 100m titles and lifted a doping cloud from the world championships.
The Olympic champion was let off with a warning after testing positive for a banned diuretic, despite calls for a three-month suspension which would have sent him home from Shanghai and interrupted his build-up to London 2012.
The Court of Arbitration for Sport (CAS) dismissed appeals by world body FINA to ban Cielo and team-mates Nicholas dos Santos and Henrique Barbosa, who also failed a test for furosemide in May.
But CAS, which held a six-hour special tribunal in Shanghai on Wednesday, slapped a one-year ban on another Brazilian, Vinicius Waked, because it was his second drugs violation.
"The CAS panel... decided to dismiss the appeals filed by FINA against Cesar Cielo, Henrique Barbosa and Nicolas dos Santos and to confirm the (Brazilian federation's) decision concerning them," the body said.
Gold for Chen, Natalia
China's Chen Ruolin won the women's 10 metres platform diving title at the world championships on Thursday after compatriot Hu Yudan's nerves got the better of her. Chen scored 405.30 points, while Hu finished on 394.00 points in the fourth round. Mexico's Paolo Espinosa took bronze (377.15).
While Natalia Ishchenko won her fourth gold medal as Russia continued their domination of the synchronised swimming.