Cracks at the top? ATP 2019 Summary and 2020 Preview A new generation of players has arrived near the top of the rankings to challenge the established Big Three of Nadal, Djokovic, and Federer. With a combined age of 103, it is simply astonishing that these same three names are at the top of the yearend rankings twelve years after they first landed there, in 2007. But what’s new this year are their primary challengers. Last year’s ATP top 10 was proclaimed the tallest and oldest of all time, with only Alexander Zverev and Dominic Thiem in their 20’s. But this year there are five players age 26 or younger – last year’s two plus Daniil Medvedev, 23, Stefanos Tsitsipas, 21, and Matteo Berrettini, 23. When the Big Three, or more rightly, the Big Four, including Andy Murray, were first dominating, their primary challengers were the likes of Davydenko, Roddick, and Nalbandian. A few years later, it was Del Potro, Tsonga, Ferrer, and Berdych. More recently it has been W
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