Re: No teens in the top 250!
I think tennis having become so physical is the reason why there are no teens in top 250. A good example on physicality's effect is that WTA is less physical and has more young players in top than ATP.
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The Saviour of Tennis
Australian Open 2014: Ended Nadal-Djokovic-Murray dominance in Slams
Monte Carlo 2014: Ended Nadal-Djokovic dominance in Masters