Australia's top-ranked male tennis player, Nick Kyrgios, is through to the third round of the Australian Open after an impressive victory over Croatia's Ivo Karlovic.
Nineteen-year-old Kyrgios, a favourite with the home crowd, won the bitterly fought first set in a tiebreak.
He took the second set as well, but the big-serving Karlovic fought back to claim the third.
Australians Bernard Tomic and Sam Groth are also through to men's third round.
Tomic beat 22nd seed Philipp Kohlschreiber of Germany, while Groth beat fellow Australian Thanasi Kokkinakis.