Samantha Stosur's coach believes her worst enemy is her own mind.

Coach David Taylor said there was is no problem physically, but mentally Stosur is struggling to deal with the levels of expectation and pressure as a top player.

Last year she proved herself as World No 6 and French Open 2010 finalist, but this year hasn't lived up to those level so far and she feels discouraged.

 Taylor said she would be able to quash those doubts by winning some close matches against great players.