5 Tennis stars who retired too soon
#4 Kim Clijsters
Kim Clijsters became the first player to be ranked No.1 by the WTA without winning a grand slam title. She achieved this feat in 2003, the same year, in which she won both French Open and the Wimbledon in women's doubles category, also becoming the No.1 doubles player in the process.
The Belgian tennis star won her maiden grand slam title as she won the 2005 US Open. Going from strength to strength, Clijsters defeated the title holder Martina Hingis in the quarter-final of the 2006 Australian Open but withdrew from the tournament due to an ankle injury.
In May 2007, she decided to retire from the sport immediately citing injuries as a big reason for cutting short her career at the age of 23.
In 2009, she made a comeback and won the US Open as a wildcard becoming the first ever wildcard to win a grand slam. She successfully defended her US Open title next year and bagged the 2011 Australian Open title as well. After competing in the 2012 London Olympics and US Open, she called time on her career.