MELBOURNE (Reuters) - Australia\u2019s head swimming coach has questioned a panel decision to clear Sun Yang of wrongdoing in refusing a doping test and urged anti-doping authorities to provide more transparency over the Chinese swimmer\u2019s case. FILE PHOTO: 2016 Rio Olympics - Swimming - Preliminary - Men's 1500m Freestyle - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 12\/08\/2016. competes. Sun Yang (CHN) of China reacts. REUTERS\/Stefan WermuthA FINA Doping Panel cleared triple Olympic champion Sun of breaching the governing body\u2019s rules in January but the World Anti-Doping Agency (WADA) is seeking to overturn the decision at the Court of Arbitration for Sport. \u201cA case like this surely doesn\u2019t help the reliability and trust in this system,\u201d Jacco Verhaeren said in comments published by Sydney\u2019s Daily Telegraph newspaper on Sunday. \u201cI think WADA, FINA, IOC, all these parties really need to work hard together to provide more clarity, more transparency.\u201d Verhaeren\u2019s comments come as Sun prepares to extend his haul of nine world titles in Gwangju, South Korea. The swimming events at the world championships start next Sunday. Britain\u2019s Sunday Times newspaper reported in January that world record holder Sun had been involved in a dispute with doping testers last September, resulting in damage to a blood sample. The Chinese Swimming Association rejected the allegations in a statement in January. On Sunday, the Daily Telegraph posted a 59-page report by the FINA Doping Panel following a hearing at which Sun admitted to refusing to comply with an out-of-competition test because of his doubts over testers\u2019 accreditation. The report said the testers had taken blood samples from Sun while at the clubhouse of his residence compound but the swimmer and his entourage then refused to let them depart with the samples during a tense stand-off. Sun\u2019s mother Ming Yang had a security guard at the residence compound get a hammer to smash open a container containing one of the blood samples. \u201cThe DCO (Doping Control Officer) was horrified,\u201d the report said, citing the tester\u2019s witness statement. \u201cShe went outside the clubhouse and discovered that the athlete and a guard had broken one of the secure sample containers with a hammer.\u201d Although describing Sun\u2019s behavior as \u201ca huge and foolish gamble\u201d, the Doping Panel agreed with his contention that the testers had not produced sufficient accreditation and that he had grounds to refuse the test. \u201cThe Doping Panel is satisfied that the Athlete was not properly notified by the DCO,\u201d the report said. The Chinese Swimming Association was not available to comment on the Daily Telegraph report. Sun, who has claimed world and Olympic titles at freestyle distances from 200 to 1,500 meters, served a three-month suspension for testing positive to a banned substance in 2014. The athlete said he was taking medication for a heart condition. The sanction was not revealed until months after its expiry. Top international swimmers have expressed dismay over Sun\u2019s recent reprieve, including Olympic 100m breaststroke champion Adam Peaty. \u201cI don\u2019t want to see this guy competing at the World Championships or Olympics against my team mates who work extremely hard to get there,\u201d the Briton wrote on Twitter in March. \u201cPretty sure neither does anybody else.\u201d Writing by Ian Ransom; Editing by Sudipto GangulyOur Standards:The Thomson Reuters Trust Principles.