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Injured Clijsters puts comeback on hold

(CNN)Kim Clijsters will have to wait a little longer to make her high-profile return to tennis. Clijsters sustained a knee injury and said she won't be able to compete at the Australian Open in two months. "I've had to make the decision that I will not be able to compete in January," the four-time major champion and former world No. 1 wrote in a tweet Monday."I am undergoing rehab and treatment for a knee injury. It's a setback but I'm determined as ever to get back to the game I love. I really appreciate all your support and encouragement."In September, Clijsters announced she was ending her retirement and coming back to tennis at age 36.READ: Barty clinches biggest paycheck in tennisREAD: Gauff becomes youngest titlist in 15 yearsShe las ...