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The Biggest Problem My Generation Faced" - Former World No.6 Opens up on Competing Against 'Big 4' - EssentiallySports
Why is Andy Murray considered a part of big 4, when he's far behind Novak, Nadal, and Federer in terms of talent? - Quora
We Are Tennis - Let's introduce you the grass courts' BIG 4: best players ever by number of titles 🙌 | Facebook
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