Gonzalez has firmly established himself as one of the world's leading - and most powerful - players over the last year.
World ranking: 15
US Open best:
2000: 2nd round
The Chilean has a big serve, ferocious groundstrokes and the kind of attacking mentality that flourishes on hard courts.
Last year he made the last eight at the US Open before losing to Sjeng Schalken, and this year he pushed Juan Carlos Ferrero close in the French Open quarters.
So far in 2003 he has reached five quarter-finals, one semi-final and one final - losing to Tim Henman in Washington earlier this month.
But inconsistency remains the 23-year-old's biggest problem and he can go from world-beater to dud within the space of a set, let alone a season.
He managed to turn in a miserable set of results during this year's European clay-court season, just when he might have been expected to build on a good start to the year.
Victories over Pete Sampras, Carlos Moya and Ferrero helped establish the Chilean's reputation, and he beat Andre Agassi on the way to the Washington final.
He is capable of blasting anyone off the court, but Gonzalez will always go for the big shot in pressure moments and still lacks the percentage game needed to win a Grand Slam.