Often outspoken and never far from controversy, Martina Hingis remains the women's tennis answer to Roger Federer – Swiss, gifted and utterly dominant in her era.

After spending over 200 weeks as world number one, Hingis finally gave up the game in 2007 after testing positive for cocaine, having returned from her initial retirement in 2003.
Czechoslovakia-born Hingis won an astonishing 45 singles titles and 38 doubles titles, including five Grand Slam singles and nine Grand Slam doubles events.

Of the Slams, all but the 2002 Australian Open women's doubles were won in the 1990s, an era during which Hingis firmly established herself as one of the finest players the women's game had ever seen.

She first broke onto the scene in January 1995, when she became the youngest player to win a Grand Slam match in the first round of the Australian Open as a 15-year-old.

A year later she became the youngest Wimbledon champion with victory in the women's doubles, as well as reaching the 1996 Australian Open singles quarter-final and US Open singles semi-final.

In 1997 Hingis became the undisputed world number one after becoming the youngest Grand Slam singles champion of the 20th century, winning the Australian Open aged just 16 years and three months.

She went on to claim US Open and Wimbledon glory that year, only missing out on the French Open – a title she would never win in singles competition.

The following year Hingis won all four Grand Slam doubles titles as well as a second straight Australian Open singles crown, before completing the hat-trick in 1999.

However, the following years signalled the start of her decline, as a series of injuries began to take their toll, and in 2003 she announced her retirement. After a brief yet unsuccessful return, including a failed drugs test, she retired for good.