The world tennis number two Rafael Nadal has launched an Australian Open broadside at Roger Federer, claiming the 16-time grand slam title winner should be doing more to support growing complaints over the professional tour.
Nadal has long advocated widespread changes to the playing schedule and even hinted at the US Open last year that strike action could not be ruled out.
The Spaniard believes Federer, who is president of the ATP Player Council, needs to back the top players' complaints.
