Nigeria's quest for Olympic Games' silverware got a boost yesterday, as the country's top female sprinter, Blessing Okagbare won the women's 100m at the London Diamond League.

Okagbare was a surprise victory after upstaging a strong field which included Olympic champion Shelly-Ann Fraser-Pryce of Jamaica and reigning world champion Carmelita Jeter.

Fraser-Pryce, the fastest woman in the world this year, never recovered her composure after stumbling after leaving the blocks and appeared to ease up half way through the race rather than chase a lost cause.

Okagbare, who had earlier dipped under 11 seconds in the heats, then held off the strong finishing American Jeter to cross in 11.01sec, with Jeter finished in 11.03 and Tianna Madison third in 11.13sec.

The men's mile was won by Silas Kiplagat of Kenya in a time of 3:52.44, with Britain's Ross Murray trailing by 0.33sec. Caleb Ndiku was third with 3:53.15.

The final event of the day saw Britain's defending Olympic 400m champion Christine Ohuruogu coasting home with victory over reigning world champion Amantle Montsho of Botswana.

Ohuruogo overhauled Montsho in the final few metres of a race held in torrential rain with a season's best of 50.42 sec. Montsho finished in 50.56sec with Rosemarie Whyte of Jamaica third.

Also yesterday, Frenchman Christophe Lemaitre produced a superb display to take the 200m with the third fastest time in the world this year of 19.91sec.

Lemaitre fought off a strong challenge from the Netherlands' Churandy Martina down the home straight with Marvin Anderson of Jamaica in third.