Andre Agassi and Andy Roddick play back-to-back on Rod Laver Arena against opponents from the Czech Republic on Wednesday afternoon in Melbourne.
Agassi faces for the first time the 6-foot-4 18-year-old Tomas Berdych. Roddick plays Bohdan Ulihrach, against whom he has a 3-0 edge.
For the women, nine of the 16 matches will be played by opponents who have never met before.
Potential show stoppers
The only former champion in the women's draw, Lindsay Davenport takes on Emilie Loit of France in the second round. No. 5 seed Davenport, who has a 42-9 record at Melbourne, won their only previous meeting on hard court at the U.S. Open in 2001.
American Jan-Michael Gambill faces a difficult second round against No. 9 seed Sebastien Grosjean. A scrappy player who runs down balls his opponents think are sure winners, Grosjean reached the semifinals here in 2001. Although he plays best on hard courts, Gambill has never been past the second round of the Australian Open.
Robin Soldering, the young Swede who Monday ousted last year's runner-up Rainer Schuettler, takes on wild card Nicholas Escude.
Off the show courts
Doubles play begins today. Martina Navratilova has teamed up with fellow American Lisa Raymond, and they take on Seiko Okamoto and
Ryoko Takemura of Japan.
Cynthia Faulkner is the tennis editor for ESPN.com.