During a practice session before her opening round match at the U.S. Open tennis championships in New York, August 31, 2009.

Jada, the daughter of former world number one Kim Clijsters of Belgium, watches her mother practice session before her opening round match at the U.S. Open tennis championships in New York, August 31, 2009.

American basketball player Brian Lynch, husband to former world number one tennis player Kim Clijsters of Belgium, holds their child Jada during Clijsters' practice session at the U.S. Open tennis championships in New York, August 31, 2009.

Back from a two-year maternity leave, former world number one Kim Clijsters of Belgium waves to her daughter Jada, during a practice session before her opening round match at the U.S. Open tennis championships in New York, August 31, 2009.

Back from a two-year maternity leave, former world number one Kim Clijsters of Belgium calls out to her daughter Jada, during a practice session before her opening round match at the U.S. Open tennis championships in New York, August 31, 2009.

Back from a two-year maternity leave, former world number one Kim Clijsters of Belgium takes part in a practice session before her opening round match at the U.S. Open tennis championships in New York, August 31, 2009.

credit photo: Reuters pictures.