Asafa Powell, the 100 metres world record holder, said yesterday he had no idea why he had not been matched with world champion Tyson Gay in the 100m sprint event tonight at the Shanghai Golden Grand Prix. Instead, the Jamaican, who set the record of 9.74 seconds three weeks ago, will run the 200m, while his American rival, who claimed the world title last month, will contest the 100m. 'I don't know why but I was just told by my manager to take part in the 200m,' said Powell. He still hopes to lower his 100m record. 'I'm looking at somewhere between 9.68 and 9.70.'