Chinese hurdler Liu Xiang's dominance in the world rankings is being challenged.

In the latest rankings released by the International Association of Athletics Federations, Liu and Cuban Dayron Robles, both with 1387 points, share the top place.

The cancellation of a 1409 points, Liu gained after setting the 12"88 record last year, and a poor 13"23 in Sheffield contributed to the waning in Liu's accumulation of points.
 
(CRI.cn July 18, 2007)