(10) Nicolas Almagro
The Spanish baseliner continues to threaten the world's top 10 but still seems unlikely to do much on the hardcourts in Melbourne.
His best results have always come on clay. Indeed, all 12 of his ATP titles have come on the dirt, including two last year - in Nice and Sao Paulo.
Possessing a big forehand, Almagro has admittedly also had some decent hardcourt wins, results which have taken him to the brink of a return to the top 10.
However, Almagro has never got through to the quarter-finals in eight visits to Australia.
His game is not suited to the slicker, faster surfaces. His long wind-up backhand is a joy to watch but probably not the best technique for the hardcourts.
He'll do well to produce a career-best effort in 2013.