If Federer is a clay mug, then Juan Carlos Ferrero and just about every other clay court player in history is too. In fact, the only non-clay mugs are Borg and Nadal. Although Nadal is a bit of a clay mug playing in a mug era and still managing to lose at times (Soderling anyone?).
Borg, Nadal, Lendl - only 3 worthy clay players.
By the way, Nadal winning on hard/grass courts was the real sign of the apocalypse.
AO 2009 and Wimbledon 2008 still hurt?
Anyway, stick to the topic, Olderer lost in QF