Delloreen Ennis-London completed Jamaica's strong showing, clinching the 100m hurdles after a late mistake by Olympic champion Dawn Harper.

The American brought down the final hurdle while leading the race, recovering to cross the line 0.03 seconds behind Ennis-London.

Bizarrely the same thing then happened in the men's sprint hurdles with Cuba's Olympic champion and world record holder Dayron Robles also catching the last barrier to finish second behind American Olympic bronze medalist David Oliver.

Olympic 400m champion LaShawn Merritt provided the United States with its only other victory on Tuesday.

In the absence of his main rival and fellow American Jeremy Wariner, Merritt posted a respectable time of 43.98 seconds.

Twice Olympic 400m hurdles champion Angelo Taylor demonstrated his talent on the flat, finishing second behind Merritt in 44.38 seconds to complete an American one-two.

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