| http://www.w3.org/ns/prov#value | - federer in 2005 could have arguably beaten everyone except rafa. if for example, federer had dominated nadal in 2006 on clay, then one would need to redraw the boundary for federer's prime...but even in 2006 nadal was still too much showing that it was more a question of their matchup and not of federer's form.
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