Serena Williams of the USA plays Kim Clijsters in the semi finals at the US Open Tennis Championships in New York

Serena Williams of the USA screams at a line judge in her semi final match against Kim Clijsters of Belgium after the line judge calls a foot foot fault before match point in Arthur Ashe Stadium at the US Open Tennis Championships at the Billie Jean King National Tennis Center in New York on September 12, 2009. Williams defeated Clijsters 6-4, 7-5 UPI/John Angelillo