Federer challenges juniors to pass the "Big 3"

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According to Eurosport, Federer shared before the Cincinnati: "Of course they will challenge us. But the question is who will overcome the Big 3. Maybe the young players will face 2 or 3 of us. In a tournament, if we all don't have injuries. We are in good form but it can't last forever because we are all over 30 years old. "