John McEnroe deems beating Rafael Nadal on clay as the toughest challenge in tennis.
Kei Nishikori won a match of extreme fluctuations on Thursday at the Rolex Monte-Carlo Masters.
Five-time former champions Bob and Mike Bryan save one match point to advance to the quarter-finals.
Boris Becker was the guest of honour on Thursday at the Rolex Monte-Carlo Masters.
Rolex Monte-Carlo Masters
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