Nadal was clearly the most improved player of 2005 and as for Gasquet there has been enough talk about him already.
These are guys who have improved this year, but are not necessarily getting recognition cause they been overlooked by performances from Nadal and the other youngsters.
Davydenko: Plays virtually every week and finally turned in some excellent results like the QF at the AO, he was outstanding against Cañas, semi at RG, semi in Hamburg and Barcelona and also some good results indoors as well. He will always be one of those guys overlooked, irrespective of how he performs.
Ferrer: He has decided not to be as passive as he was previously and showed a marked improvement, sure he had the benefit of a meltdown of Malisse and the injury of Zabaleta in Monte Carlo, but he was able to improve off the clay with good performances in Miami and Madrid, plus doing well in RG and Rome. Great fighting spirit and won a lot of matches, that he should have been put away in.
Ginepri: Decided to stick a very simple game plan which works for him and gets the job done and once he beat Roddick for the first time, then he rode on a wave of confidence throughout the American season, with his excellent performances in Cincy and the US Open. All these guys should be looked at by some of the more talented players out there, as an example of what can be done if prepared to put the work in.
Ljubicic: Has had a big season with the potential to lead Croatia to its first Davis Cup, he has done well, though still lacking a breakthrough in the big events, losing finals to Federer and Nadal are not bad performances, but he was favoured to beat J.Johansson and Berdych. His efforts won't be overlooked not with the vocal Croatian MTF population.
It's not a question of whether I like these guys or not, but they all have stepped up to the plate in 2005 and improved their games noticeably. The question is it a career year for them, or can they improve more?
There are others as well like Gonzalez, but who have the most improvements from the players who have been around for more than 2 years.