Brazilian boxer David Lourenco should definitely present the Youth Olympic gold to his father as his father's tearful plea prevented the headstrong boy from quitting the sport earlier this year. 'I was about to quit before the world championships because I didn't have the motivation to train every day,' Lourenco said. 'When I told my father I was going to quit, he was crying and said I shouldn't.' Then a heartfelt plea from his devastated dad persuaded Lourenco to change his mind and the decision paid off when he won a Youth Olympic Games gold medal in the welterweight (69kg) final on Wednesday. Speaking after his success, the 18-year-old said he once struggled because he had lost his passion for boxing. But his father changed his life. Lourenco agreed with his advice and success soon followed. He won the World Junior Championships in May and a month later turned his attention to the inaugural Youth Olympics in Singapore. His gold medal victory capped the memorable turnaround for him. 'I've been at it a long time,' he said. 'My father suffered with me the whole time I was boxing so I decided to keep at it. Now, I'm still aiming for London 2012 and also Rio de Janeiro 2016.' 