Henman's fall could seriously affect his chances of getting a seeded position at the US Open, which begins later this month, for most of the world's leading players are expected to compete at Flushing Meadow.
Last year Henman reached the last 16 at the US Open before losing to Stefan Edberg and, if he fails to get that far again, could drop even further down the rankings.
Pete Sampras defeated Austrian Thomas Muster 6-3, 6-4 to capture the ATP Championship in Mason, Ohio, on Sunday. It was the 49th career title for the American, tying him with Boris Becker for the most tournament victories among active players on the ATP Tour.
Monica Seles survived a match point to win her 39th career title by beating Lindsay Davenport 5-7, 7-5, 6-4 at the Acura Classic event on Sunday in Manhattan Beach, California.
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