RIO DE JANEIRO, April 27 (Xinhua) -- World record holder Cesar Cielo rated his performance "very slow" after winning the 100m freestyle event in 48.28sec at the Brazilian Olympic trials on Friday.

Marcelo Chieriguini finished second in the race with a time of 49.05sec and France's Frederick Bousquet third (49.05sec) at the Barra da Tijuca pool in Rio.

Cielo's time was well above Australian rival James Magnussen's 2012-best mark of 47.01 and his own world record of 46.91 set in 2009.

"The time was very slow, especially the first 25m. I think everybody is feeling weary from the competition," the 25-year-old Brazilian said.

"It's not my main focus at the Olympics anyway. My priority is to defend my 50m Olympic title and after that perhaps see if I can do well in the 100m."

On Wednesday Cielo won the 50m freestyle event in 21.38sec - the fastest time so far this year.