Federer, Rafa, Isner on string tension. (Rafa: “… I never pay attention to all this stuff… I just try to play with my feelings…”

Red clay winning percentage:

Nadal: 91% (473-44)

Federer: 76% (221-71)

Blue clay winning percentage:

Nadal: 50% (1-1)

Federer: 100% (5-0)

Average winning percentage between the two kinds of clay:

Nadal: 70.5%

Federer: 88%

Therefore Roger Federer is statistically 17.5 percentage points better than Rafael Nadal on clay.

It’s clear that Federer, the master…