Sebastian Korda, son of 1998 Australian Open men's champion Petr Korda, won the boys singles title, beating Chun Hsin-tseng 7-6 (7-5) 6-4 in the final on Rod Laver Arena.
Korda fell behind in both sets, but used his powerful groundstrokes to pull it back. He trailed 2-5 in the first-set tie-break before reeling off five consecutive points for the decisive lead.
Serving for the match at 5-4, American Korda utilised his thunderous serve to set up two match points. He only needed one as the scurrying Chun from Taiwan sent a backhand wide to concede the match.
Korda said he wanted to win the title as a birthday present for his father, who turned 50 last week.
"Definitely, that was the main goal here, to try to get this tournament for my Dad on his 50th birthday. My Mum's birthday is on February 5, so it's special as well," he said.
Liang En Shuo became the first player from Taiwan to win the girls singles crown, beating France's Clara Burel 6-3 6-4. It was the 18th consecutive singles victory for 17-year-old Liang.