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quick and dirty translation, still should be much better than a machine translation https://elpais.com/deportes/2021-03-08/djokovic-ahora-lo-tiene-todo-paz-y-guerra.html Now Djokovic has it all: war and peace With 311 weeks at the top of the ranking, the Serb has ousted Federer as the most...

In 2019 I read an article which distinguished between inside and outside groundstrokes, inside being those where the ball does not cross your body before contact, and outside being those where the ball does. It mentioned that it is easier to hit a higher quality ball on inside groundstrokes...

Neat article showing the different wear patterns over different eras (there's more photos I just picked a few): http://bit.ly/2LK4t9o