'I don't really focus on the splits. I kind of just go out there and race. That's what it all comes down to.'
In the women's 400m individual medley, world record holder Stephanie Rice had the fastest time going into Sunday's final.
The Australian swam a 4:34.62, to beat American Elizabeth Beisel, who finished in a time of 4:34.80.
Hungarian Katinka Hosszu had the third-fastest time with 4:35.15, while Canadian Tanya Hunks and American Julia Smit also advanced to the final with the equal time of 4:35.84.
The competition ends in the Foro Italico on Sunday evening with the finals of the men's 50m backstroke, the 400m individual medley, the 1,500 freestyle and the 4x100 medley relay, as well as the women's final in the 50m breaststroke, the 50m freestyle and the 400m individual medley.
After the finals a short closing ceremony will be held.