Among much more, Clijsters might be recognized most for her athleticism, including her trademark splits reaches.
Clijsters' first Grand Slam final came at the 2001 French Open, falling to Jennifer Capriati 12-10 in the third set.
Clijsters won her first Sony Ericsson Championships in 2002, beating then-No.1 Serena Williams in the final.
In the first all-Belgian Grand Slam final ever, Clijsters lost to Justine Henin at the 2003 French Open.
Clijsters, a world No.1 in doubles too, won her first major doubles title at the 2003 French Open with Ai Sugiyama.
Clijsters won her second straight Grand Slam doubles title at 2003 Wimbledon, again partnering Japan's Ai Sugiyama.
Clijsters was the first Belgian to rise to No.1 on August 11, 2003, and was honored in Los Angeles the day before.
Clijsters lost to Justine Henin in another all-Belgian Grand Slam final in prime time at the 2003 US Open.
Clijsters won her second straight Sony Ericsson Championships in 2003. Billie Jean King was on hand with the trophy.
Clijsters fell to 0-4 in Grand Slam finals with another loss to Justine Henin at the 2004 Australian Open.
Several injury lay-offs hampered Clijsters' first career, including several bouts with a left wrist injury.
Clijsters won the 2005 US Open Series and went on to win the US Open, taking in a record $2.2-million paycheque.
Clijsters beat Mary Pierce in the 2005 US Open final for a celebrated first career Grand Slam singles crown.
Clijsters posed with her 2005 US Open trophy in front of the Unisphere, a day after winning her first major title.
Clijsters' father, the late Leo Clijsters, a former soccer player in Belgium, was ever-present during her career.
Clijsters fell to her knees after winning her last title at Sydney in 2007, edging Jelena Jankovic in the final.
Clijsters' last Grand Slam came at the 2007 Australian Open, where she fell to Maria Sharapova in the semifinals.
Clijsters was met with adoration after playing in front of her home crowd one last time at Antwerp in February 2007.
Clijsters' final match came at Warsaw in the spring of 2007, falling to Julia Vakulenko in straight sets.
Kim Clijsters was a loyal member of Belgium's Fed Cup team, playing for it every year from 2000 to 2006.