By Nick Mulvenney
The 27-year-old, who returned after a two-year retirement in 2009, said earlier this month she hoped to play on for four more years but Friday indicated her involvement in the game might be reduced after this year.
Inspired by Clijsters, her compatriot Justine Henin also made a comeback for last year but the seven-times grand slam champion retired for a second time this week on medical advice because of an elbow injury.
Clijsters, who lost to Henin in the 2004 Australian Open final, said she accepted injuries as part and parcel of being a top athlete.
"I had injuries before, so I knew when I started again I knew that that could be part of the second career as well," she said.
"It's not just all the beautiful things that I thought of when I started again."
The former world number one has also made it quite clear, however, that her family -- she had daughter Jada during her two years off -- were now her absolute priority with tennis coming a very poor second.
Clijsters' defeat of Russian Vera Zvonareva in the Melbourne semi-finals Thursday ensured that she would replace the Russian as number two in the world.
(Editing by Ossian Shine)