#2 Stefan Edberg: 19 years 323 days (1985)
The only player to win the junior Calendar Grand Slam (1983), Stefan Edberg arrived at the 1985 Australian Open fresh off winning the gold medal at the 1984 Olympic games in Los Angeles.
In his third appearance at the Australian Open, and 8th overall at a Grand Slam tournament, Edberg beat John Lloyd in straight sets in the quarterfinals. He then recovered from a two sets to one deficit before downing Ivan Lendl 9-7 in the fifth to book a final clash with two-time defending champion and fellow countryman Mats Wilander.
A break apiece in the first two sets meant that Edberg was in cruise control against his more illustrious compatriot. Two breaks followed in the third set as Edberg ended the two-year Australian Open reign of Wilander to bring the last ever Australian Open to be held in December to an end.
In the process, Edberg became only the second teenager in the Open Era to triumph at the Australian Open, as Kooyong Park hosted the last edition of the tournament before it moved to the larger Melbourne Park Arena. A schedule change which brought back the Australian Open to January meant that there was no edition of the tournament in 1986.
How did Novak Djokovic meet Jelena Ristic? All about the most admired couples in tennis