Davyenko = overachiever [despite poor resutls at slams]
Nalbandian = biggest underachiever [despite good results at slams]
Davy has maximised his potential whereas Nalby clearly hasn`t..!!
Thus, PMK >> Fat Dave
Nalby slam results really aren't that much better. He has the final that Davy doesn't but only leads in semis 5-4 and QFs 10-9. So there isn't a huge difference, basically the luck of playing Malisse in a semi. And Nalby's final is a bit of a fluke because he never got close again at Wimbledon with his next best result receiving a straight set demolition in quarters by T. Johansson.