CANBERRA, Jan. 15 (Xinhua) -- U.S. Open champion Juan Martin del Potro will play at the Australian Open despite pulling out of the Kooyong Classic with a wrist problem.

    World number four Del Potro pulled out of the warm-up tournament on Thursday after playing only one match.

    The 21-year-old Del Potro has been seeded fourth at Melbourne Park. The tournament starts on Monday.