Calleri enjoyed far and away the best season of his career in 2003, picking up his first title and moving into the world's top 20.
World ranking: 22
Australian Open best:
2nd round (2001)
2003: 1st round
2002: 1st round
2001: 2nd round
The Argentine claimed his first title in Acapulco and followed it up with a run to the final in Estoril, as well as a semi-final spot in Barcelona.
He then topped that by reaching the final of the Hamburg Masters, where he was beaten by compatriot Guillermo Coria.
Calleri is one of several Argentines moving steadily up the rankings and, like his compatriots, he is very much a claycourter.
Away from the red stuff, Calleri's record is fairly unimpressive.
He has managed victories over Marat Safin, Tim Henman, James Blake and Thomas Johansson on hardcourts during his career.
But just five wins on the surface last year suggests he will struggle to make the fourth round of a Grand Slam for the first time at Melbourne Park.