China’s Sun Yang, the ‘enfant terrible’ of competitive swimming, is set to undergo another test of his fragile temperament at the world championships after a turbulent 2016 Olympic Games. Likewise, there will be nowhere for Joseph Schooling to hide in Budapest this month after he stunned Michael Phelps to win Singapore’s first-ever Olympic gold last year in Rio de Janeiro. Bad boy Sun spearheads China’s assault and will be looking to exact revenge after Australian Mack Horton robbed the hulking Chinese star of his Olympic 400 metres freestyle in Brazil. Emotions boiled over after a pulsating final in Brazil when Horton branded Sun a “drug cheat” – a reference to a three-month doping ban his rival served for taking a banned stimulant Sun said was for a heart complaint. The pair traded insults, triggering a diplomatic row with Chinese state-run media calling Australia a “second-class citizen” of the West, before Sun bounced back to win gold in the 200m. Expect sparks to fly again in Budapest with Sun and Horton set to lock horns in the 200m and 400m, as well as the 800m and 1,500m freestyle, which are events Sun has dominated in recent years. “As captain of Chinese swimming team, I need to shoulder more responsibility,” the multiple Olympic and world champion told Xinhua . War in the water, part II: Sun Yang and Rio conqueror Mack Horton set to clash once more at World Championships “I must encourage my teammates, help them steady their mood and lead them to make breakthroughs in the world championships.” A notable absentee for China will be pin-up Ning Zetao, who will not be in the Hungarian capital to defend his 100m freestyle world crown, citing an abdominal injury after failing to qualify. Xu Jiayu will compete, however, after taking Olympic silver in the 100m backstroke behind American Ryan Murphy. Schooling’s shock Rio victory over Olympic legend Phelps in the 100m butterfly final puts him firmly in the firing line in Budapest. Sun Yang reasserts his dominance with clean sweep and year’s fastest times at Chinese national championships But the 22-year-old clocked 50.96 seconds in Austin, Texas earlier this month, just 0.09 off American Caeleb Dressel’s world-leading time, to suggest he could be peaking at just the right time again. “Caeleb has the fastest time this year, but I am not going to let anyone take that number one spot from me,” Schooling said. With Phelps ending his storied career in Rio, Japan’s Kosuke Hagino has been tipped to take over as the world’s premier medley swimmer. The 22-year-old won gold in the 400m medley in Rio, but was comfortably beaten by the great American in the 200m final. Controversial Chinese swimmer Sun Yang beaten again – but this time it’s not in the pool Whether or he can convert Olympic gold and silver into double gold in Budapest could depend on countryman Daiya Seto, who has had Hagino’s number in recent domestic competitions. Seto, who took bronze in Rio over 400m, is chasing a hat-trick of world titles in the longer medley after capturing gold in Barcelona and Kazan. Japanese schoolgirl Rikako Ikee, a five-event national champion, will be another name to watch in the freestyle and butterfly.