[Rusty Backhand]

NEW YORK, Sept 3 (Reuters) - Serena Williams dominated her sister Venus not so long ago but when the two meet in the fourth round of the U.S. Open on Sunday she will find herself in the unfamiliar position of underdog.

http://go.reuters.co.uk/newsArticle.jhtml?type=tennisNews&storyID=9552690&section=news&src=rss/uk/tennisNews