Germany's Paul Biedermann broke the world record in the men's shortcourse 400m freestyle at the World Cup swimming meet here Saturday. The 23-year-old German clocked 3 minutes 32.77 seconds to break Australian Grant Hackett's previous mark of 3 minutes 34.58 seconds, despite only getting the green light to race on Friday after recovering from a thigh injury. Biedermann inflicted the first defeat on Olympic champion Phelps in four years at the World Aquatics Championships in Rome last summer in the 200m freestyle and also took the American's world record. The pair are set to clash again here on Sunday when the men's 200m freestyle heats get underway in the mornings with the finals on Sunday evening. 