Clijsters was forced to retire from her third-round match against Patty Schnyder after sliding awkwardly into the net
The Belgian injured her right leg in an awkward slide to the net during a third-round match against Switzerland's Patty Schnyder.
The Belgian was beaten by Russia's Svetlana Kuznetsova in the semi-finals of the Warsaw WTA claycourt event.
The Belgian won 7-6, 6-3 to earn a meeting with Russian second seed Svetlana Kuznetsova in the semi-finals of the WTA event in Warsaw.
The world number two is worried she will not be fit enough to give her best in next month's French Open championships.
After injuries, illness and doubts they would ever return to top level tennis, Henin-Hardene and Clijsters are back upto speed.
Belgium's Kim Clijsters downed Maria Sharapova 6-3, 7-5 to win the Nasdaq-100 Open and claim her second consecutive title
The Belgian capped a remarkable comeback to the top level of the game following wrist surgery, beating the world No.1 in the final of the Pacific Life Open.
While Wimbledon champion Maria Sharapova was buried 6-0, 6-0 by Lindsay Davenport in the semi-finals.
Clijsters says she hopes she has discovered the "magic formula" to beating the Williams sisters.
Venus Williams beat local favourite Kim Clijsters 6-2, 6-3 to reach the semi-finals of the Antwerp Diamond Games tournament.
A complete round-up of the morning session of play at the Australian Open.
The world number two is doubtful for the the Australian Open starting next week.
Former world number one Kim Clijsters intends to return from her long-term injury at the Antwerp Diamond Games in mid-February.
The 21-year-old, who underwent surgery on her left wrist last year, has not recovered enough to play in the Australian Open.
"I'm extremely happy with my early Christmas present," said 20-year-old Belgian Clijsters.\n\n
American brothers Bob and Mike Bryan were named ITF men's doubles champions.
Sponsorship wrangles will keep Kim Clijsters away from Athen next year.
Belgium's Justine Henin- Hardenne secured the year-end number one ranking in resounding fashion on Friday.
But the Belgian will not need more surgery on her wrist after suffering an injury in the Belgian Open.
The US Open champion said the only secret of her success is hard work.
Belgian Kim Clijsters made a successful return from a long injury absence on Wednesday, overcoming dogged Czech Iveta Benesova 7-6, 6-2 in the second round of the Belgian Open.
Clijsters also said she considered Serena Williams and her sister Venus Williams as among her best friends.
Newly-crowned world number one Kim Clijsters feels she is ready to win her first grand slam title at the U.S. Open.
The Swiss stuttered to a 6-3, 2-6, 6-3 win over Israel's Shahar Peer in the fourth round of the French Open.
The world number two decided she had insufficient time to get fit for the last Grand Slam of the year.
Revenge will again be in the air when the top seed meets Henin in a semi-final grudge rematch on Thursday.