Kaurin threw the discus 52.85 metres, which is 21 cm better than the previous world record set by China's Hou Zhanbiao in 2015.
Although that is not a Paralympic sport, it does not diminish the success of the 23-year-old Kaurin, who will compete in his main event, shot put, in the upcoming Olympic Games in Paris.
The fourth edition of the Zagreb Open saw the participation of more than 80 competitors from ten European countries, including numerous Paralympic medalists.