Olympic and world champion Cesar Cielo was cleared to compete at the World swimming Championships after the Court of Arbitration for Sport (CAS) upheld a decision by the Brazilian swimming federation Thursday. Swimming governing body FINA had challenged a Brazilian federation decision to give Cielo only a warning after he tested positive for furosemide, a banned diuretic and masking agent, at a meet in Rio de Janeiro in May. Decisions for two other Brazilian swimmers – Nicholas Santos and Henrique Barbosa – were also upheld.