Belgium's Kim Clijsters has advanced to the U.S. Open final by beating defending champion Serena Williams 6-4 7-5.
However the match ended in controversy when the American was called for a foot-fault on a second serve to go match point down.
An angry Williams argued with the lineswoman who reported her for verbal abuse.
Having already received a warning earlier in the match for smashing a racket, Williams was handed an automatic point penalty for a second violation which handed the Belgian the match.
Clijsters, playing in only her third tournament after taking a two-year break to start a family, became the first mother to reach a grand slam final since 1980.