In 1994, Tamsyn Manou (18 championships titleholder) took only 52.90 seconds in a 400m dash in 1994, 1.94 seconds faster than in 1993.
52.90 1994 1993 54.84 Tamsyn Carolyn Manou (nee Lewis, born 20 July 1978) is an Australian track and field athlete and middle-distance runner, who has won a total of eighteen Australian Championships at 400 metres, 800 metres and 400m hurdles. 
