Nadal and Federer braced for Djokovic, Murray attacks

It's 10 years since the rankings didn't feature either Rafael Nadal or Roger Federer in the top two, but current leading men, Novak Djokovic and Andy Murray, still face a test of clay-court nerve.

On Sunday, Nadal begins his bid for a ninth successive Monte Carlo Masters title.

The 26-year-old Spaniard, who was seven months out of action with a knee injury, has already hammered home his clay-court dominance in 2013 with comeback titles at Sao Paulo and Acapulco.