The new balls.

Nadal and Murray have been complaining (they seem to do that a lot these days) about the constant change in design of the balls in the Asian swing of the tour.

I've not been following Shanghai so can anyone tell what tangible changes and effects can be observed with the new balls?

http://www.reuters.com/article/2011/10/12/us-tennis-men-shanghai-balls-idUSTRE79B58P20111012

Nadal's only complaint afterward was with the balls being used in Shanghai, which he said are much faster than those at the Japan Open in Tokyo last week. He said the same balls should be used when there are several tournaments on the same surface in a row, such as the hard-court tournaments in Thailand, Japan and China on the tour's autumn Asian swing.

"Something must change because is too dangerous for the shoulders," he said. "That's something that, in my opinion, can change. In my opinion, not difficult to change."

http://espn.go.com/tennis/story/_/id/7091313/rafael-nadal-andy-murray-advance-jo-wilfried-tsonga-upset-shanghai-masters

laverfan wrote:the balls being used in Shanghai, which he said are much faster than those at the Japan Open in Tokyo last week.

We need faster balls all round. My complaint would be the slower ones the week before.