Young and hungry: Five who could fire up Melbourne

Grigor Dimitrov

The 26-year-old Bulgarian heads to Melbourne a dizzy No 3 in the world rankings behind only Rafael Nadal and Roger Federer.

Nicknamed "Baby Fed" early in his career for his Federer-style game, Dimitrov has struggled to live up to the comparison and was as low as 40 in the world in mid-2016. But he bounced back to enjoy the best season of his career in 2017, winning four titles, including his first Masters crown in Cincinnati.