Gay clocks stunning 100m in China

Tyson Gay equalled the second fastest time ever over 100m with 9.69 seconds at the Shanghai Golden Grand Prix.

The American has struggled with a groin injury of late but still won a Worlds silver medal behind Usain Bolt.

At China's end-of-season meet, Gay, 27, equalled the world record Bolt set when he won Olympic gold last year before he reduced it to 9.58 secs in Berlin.

American Carmelita Jeter ran 10.64 secs to overtake Marion Jones as the world's second fastest woman over 100m.

Only the late Florence Griffith-Joyner has run faster having run 10.49s.

Gay, who has been suffering from a strained groin and is set to have an operation, admitted at the start of the month he had been "running on one leg".

After running the third-fastest 100m in history, 9.71, at the World Championships, where he had to pull out of the 200m, Gay beat Jamaican Asafa Powell by 0.16s in China with American Darvis Patton in third (9.89).

Gay revealed afterwards he intends to challenge Bolt's world record when he returns to full fitness.

"I'm not too motivated because I've not been fully healthy," he said. "I ran my run so well, even though my groin hurts."

The Chinese crowd saved their biggest cheer for former world and Olympic champion hurdler Liu Xiang as he returned to action for the first time since limping out of the Beijing Bird's Nest last year.

"Being back on the track is a pivotal step for me," Liu said ahead of the 110m hurdles race.

The 26-year-old 2004 Olympic gold medallist had an operation in the United States in December to repair the Achilles tendon that forced his agonising Olympic withdrawal during qualifying.

However, the local superstar was pipped on the line by American Terrence Trammell with both men clocking 13.15s.

"I didn't expect I could run so fast, but once I stepped on the track I could not hold back," Liu said.

Meanwhile, Russian Olympic champion Yelena Isinbayeva failed in three attempts to improve her own pole vault world record of 5.06m.

There were other victories for Wallace Spearmon in the 200m, while Britain's Rob Tobin impressed in second place behind Lashawn Merritt in the 400m.