Lindsay Davenport is pulling out of the Australian Open because she is pregnant with her second child.

The three-time Grand Slam singles champion and former No. 1-ranked woman gave birth to a son, Jagger, in June 2007. Davenport then returned to the tour, although she hasn't played since the U.S. Open in August of this year.

Just last week, the Australian Open announced Davenport would play in the tournament, which begins Jan. 19.

“Of course this unexpected but exciting surprise now means I will be putting tennis on hold for the foreseeable future,” Davenport said in a statement issued Wednesday by her agent.