Australia is ready for a relay blitz at this year's athletics world championships, with the women's 4x100m squad sealing qualification on Sunday.

Competing in the Golden Grand Prix meet in Kawasaki, Japan, the team of Sally Pearson, Charlotte van Veenendaal, Laura Whaler and Melissa Breen clocked well under the qualifying time in 43.69secs to finish second and ensure Australian representation in all four relay events at August's world titles in Daegu, South Korea.

"You have no idea how excited we are," Olympic silver medallist Pearson said.

"It took so long for the time to appear on the big screen but, once we knew, we're just jumping, screaming and hugging on the back straight.

"Today was the last chance we had to clock the qualifier and we did it - bring on Daegu."

It will be the first time Australia has had a team in all four relay events at the championships since Paris in 2003.

Despite the fast time, Japan A won the race in a national record of 43.39 with Japan B third in 44.62.

Australian champion Brendan Cole is still trying to post a qualifying time for the world championships, despite clocking a season-best 49.60 seconds on his way to victory in the men's 400m hurdles.

Cole's time was just 0.20 seconds off the qualifying mark for Daegu.

Lauren Boden, who trains with Cole under the guidance of Matt Beckenham, made it two wins from two starts in Japan in the past week, after clocking 55.86 seconds to take out the women's 400m hurdles.

Breen returned to the track after her relay run to come third in the women's 100m, while new Australian 800m titleholder James Kaan came second in the men's 800m event.

In the men's 100m, Aaron Rouge-Serret clocked 10.42 to finish second behind 2003 world champion Kim Collins (10.40).

In the field events, world and world indoor championship bronze medallist Mitchell Watt began his 2011 international campaign in style with second in the men's long jump.

Watt posted 8.07m to be edged out by Bermuda's Tyrone Smith (8.09m), with Australian Robbie Crowther posting a personal best 8.03m for fourth spot.

Elsewhere in the field events, Australian-based Sergey Kucheryanu cleared 5.45m for second behind Japan's Daichi Sawano (5.60m) in the men's pole vault.

The Golden Grand Prix concludes a three-meet series in Japan, with Australia's best set to battle it out at round two of the Diamond League in Shanghai on May 15.

AAP