Dhaka, May 21 -- A 12-year-old Chinese swimmer has been hailed a "sensation" and is on course for the world championships after clocking the fastest time in history in her event at that age.Yu Zidi's blistering 2mins 10.63sec in the women's 200m individual medley at China's national championships was well inside the standard required to qualify for Singapore in July-August.

China's swimming association told AFP they will wait until the week-long national competition in Shenzhen finishes on Saturday before finalising their squad for the world championships in Singapore.

Yu's scintillating swim on Sunday gave her second place behind Paris Olympian Yu Yiting in Shenzhen.

The global governing body, World Aquatics, tweeted: "12-year-old sen...