Serena Williams pulls out of Pan Pacific

World number one Serena Williams has withdrawn from next week's Pan Pacific Open in Japan because of injury, organisers said on Thursday.

Williams cut her foot on broken glass at a restaurant shortly after winning her fourth Wimbledon crown in July.

Tournament organisers said the 13-time Grand Slam winner had not fully recovered after an operation on the injury, which also forced her out of the US Open.

Most of world's top 30 players will take part in the two million dollar hard court tournament in Tokyo from September 26 to October 2.