Originally Posted by The-Champ
It could very well be that clay is his best surface. He said he grew up on it. Without Nadal, people today would probably say CLAY is federer's best surface. He probably would have had 6 FOs and truckloads of masters on it.
Sorry there, I just don't think that correlates with the record. His wins on faster surfaces seem to come much easier to him. Look at his WTF record for example. He enjoys a more attaching game that Roland Garros and the Australian Open just don't suit - being the two slow Grand Slams. He IS strong on clay - but that is just because his game is so solid overall. But I don't think any commentator would say it is his best surface. His best surface I think is fast hard court (so US Open).
Federer's losses at Roland Garros exactly parallel Nadal's losses at the WTF. Nadal can do well - eg make the finals in his peak fast court year (2010) but it isn't enough really to put him over the top on his worst surface (indoor). The French Open is more well known and has a higher profile that the WTF hence the Federer losses are talked about more than the Nadal losses at the WTF.