I'm sure some of you have noticed this but it stands at 1/13.
The only win came against Tsonga at Wimbledon 2007, but even then Tsonga was a wildcard ranked 110 at that tournament.
Losses are to Nalbandian, Ginepri, Hewitt, Robredo, Tsonga, Murray x3, Monfils, Djokovic, Ferrer x2, and Mayer.
Of course he's not been expected to win most of those matches considering who he has come up against but more than a fair few of them have been more than winnable.
He's also made more R16 of grand slams than Del Potro (10) and Tsonga (13) which is pretty shocking considering one has a grand slam while the other has made a grand slam final and several more semis.
So the big reason is why is his record at that stage of Grand Slams as big of a joke as it is?