Every day, John and his younger sister Ilsa cycled to the Bankstown pool before sunrise, for a two-hour training session, before returning home for breakfast and then attending school. After school, they would cycle back to the pool and repeat the training regimen. In 1958, the results of his training began to materialise, when he started to win his first national titles and break his first world records. In Sydney in January, in the space of eight days, he broke world records in the 200 m, 220yd, 400 m, 440yd, 800 m and 800yd, for a total of six world records. He set another eight in February and March, including a 1500 m and 1650yd world record, and proceeded to win the 220yd, 440yd and 1650yd freestyle at the Australian Championships. At the 1958 Empire Games in Cardiff, he won the 440yd and 1650yd and then combined with John Devitt, Gary Chapman and Brian Wilkinson to claim the 4x220yd freestyle. In 1959 he broke six world records in the same six events as he did in January the previous year, and was the first person to sweep the freestyle events from 110yd to 1650yd at the Australian Championships, winning the Helms Award. He decided in conjunction with Talbot to concentrate on the 400 m and 1500 m events for the Olympics, and in 1960, at the Australian championships, set world records in the 400 m, 440yd, 1500 m and 1650yd events. He also won the 220yd event in world record time, but it was not an Olympic event at the time.