Legendary Liu not impressed by changes

SHENZHEN, Guangdong - Chinese table tennis great and coach of the country's men's team Liu Guoliang is concerned changes to the sport are taking their toll on players.

The International Table Tennis Federation (ITTF) this year introduced a new kind of ball, which is made from Acrylonitrile Butadiene Styrene (ABS).

Top men's stars Ma Long and Zhang Jike this week pulled out of China's team trials for May's world championships in Dusseldorf, Germany, because of fitness problems.