Clijsters hung up her racket in 2007 after a succession of injuries, with one Grand Slam to her name, the US Open in 2005.
She then surprised many by returning to the court in 2009, not long after giving birth to her daughter.
Clijsters then went on to win the US Open in 2009 and 2010. Becoming the first mother to win a Grand Slam since Evanne Goolagong in 1980 along the way.
The Belgian also added the 2011 Australian Open to her trophy cabinet, before retiring again in 2012.
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