Brianana Rollins became the third fastest performer of all-time in the 100m Hurdles, smashing a long-standing US record with a stunning time of 12.26.
With a legal wind in favour of the American, the 21-year-old left behind her more experienced compatriot LoLo Jones.
"I just feel so overwhelmed, so emotional. It is so amazing," said Rollins, after beating her 12.39 personal best by 0.13 seconds.
With only five weeks before the World Championships in Moscow start, this result is a serious message to Olympic and world champion Sally Pearson, who has dominated the discipline over the last two seasons.
"Looks like I am bringing my A++ game to worlds this year," Pearson Twitted after seeing the result.
The American was asked whether she thought breaking the long-standing world record was possible and she answered: "I don't know. We'll see.”
Not many expected such a result from Rolling, whose last season’s best equalled 12.70 seconds.
Queen Harrison came second in 12.43 whilst Nia Ali came third. Along with Dawn Harper, who was given her countries’ wildcard entry, they all qualify for the US team for the event in Moscow.
In other news, four-time Olympic champion Sanya Richards-Ross, dealing with big toe problems did not qualify for the world championships, which start of 10th August.
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