On August 10, 2009 in Cincinnati, Kim Clijsters played her first match after 27 months out - and won.
Clijsters would win three matches to make the quarters there before falling to then-No.1 Dinara Safina.
But her momentum would build fast - two tournaments later Clijsters would take the US Open by storm.
Clijsters beat both Williams sisters en route to the final then beat Caroline Wozniacki for the title.
Clijsters was the first wildcard to win a Grand Slam title, and the first mother to win one since 1980.
During her 27 months in retirement, Clijsters married Brian Lynch and had her first child, Jada.
And in the 25 months of her comeback Clijsters won seven of her 41 WTA titles, including Miami in 2010.
Three of those seven WTA titles were Grand Slams - first the 2009 US Open, second the 2010 US Open.
Clijsters' 2010 US Open title gave her a three-tournament, 21-match winning streak at that Grand Slam.
Clijsters won the WTA Championships in 2010 as well, her third career title there, after 2002 and 2003.
Clijsters kept on lifting her game at the biggest events into 2011, making the Australian Open final.
And Clijsters would win the 2011 Australian Open - her first Grand Slam title outside the US Open.
Clijsters was 1-4 in Grand Slam finals in her first career but a perfect 3-0 in them in her second career.
Shortly after the Australian Open title, Clijsters returned to No.1 - the first mother ever to be No.1.
Clijsters achieved another first at the 2012 Australian Open - her first win over a World No.1 at a Slam.
And Clijsters kept checking off the firsts later in 2012, playing her very first Olympics in London.
But Clijsters had announced the 2012 US Open would be her last tournament - she fell in the second round.
Clijsters - four-time Grand Slam champion, former No.1 - spoke to the crowd one last time on Ashe Stadium.
Clijsters against Justine, Venus and Serena in her first career? 15-25. Clijsters V2.0 against them? 7-0.
Clijsters' name was taken off the WTA Rankings on September 17, 2012, her last career ranking being No.20.