The trio will each take home a cool 250,000 dollars, but will have to compete in the IAAF world athletics finals in Stuttgart on September 9-10 to be eligible for the prize.

Powell, joint world record holder with drug-tainted American Justin Gatlin, clocked up his record 11th sub-10sec race this year, romping home in a meeting record of 9.86sec, 0.1sec ahead of American Tyson Gay.

There was no repeat of the awful start Powell suffered in Brussels last week, and once he hit his elegant long stride there was no stopping the 23-year-old as he powered away from the field.

Wariner duly wrapped up his perfect six from six in the men's 400m, producing a strong final bend to outrun pacesetter Lashawn Merrit, who himself was caught by Gary Kikaya of the Democratic Republic of Congo.

The 22-year-old, the only athlete to have won two gold medals in both the 2004 Olympics and last year's world championships, fell short of his target of another sub-44sec run, timing 44.26sec.

Richards hit the 300m mark a full 10 metres up on the field and won comfortably in 49.81sec ahead of compatriot Dee Dee Trotter (50.87sec).

In the hunt for a share of a second pot of 500,000 dollars for athletes having won five out of six events, there was good news for Kenenisa Bekele and Irving Saladino, who won their 5000m and long jump events (8.35m) respectively.

But there was heartbreak for Tirunesh Dibaba who lost out on a perfect six as Ethiopian compatriot and Olympic champion Meseret Defar won a frantic sprint of a last lap in the women's 5000m to come home in 15min 02.51sec.

Bekele fell well short of bettering his world record in the 5000m, coming home in 12:57.74, more than 20sec off the pace he set in Hengelo two years ago.

The 24-year-old, who also holds the world record in the 10,000m, a distance in which he is world and Olympic champion, was again a class above the field -- none of whom broke the 13min barrier -- but left himself too much to do on the final lap.

Kenyan Augustine Kiprono Choge, 19, won the 1500m in a personal best of 3:32.48, a full second ahead of Said Saaeed Shaheen, the Kenyan-born naturalised Qatari who is the double steeplechase world champion.

Sherone Simpson made it a Jamaican sprint double, easily winning the women's blue riband event in 10.92sec, benefiting from a fast start to outpace Me'Lisa Barber (11.21sec) and Debby Ferguson (11.24sec).

American Virgina Powell claimed the 100m hurdles in 12.72sec, while Norway's Olympic and world champion Andrea Thorkilsden won the men's javelin with a best of 87.43m.