Latest Commonplace post is about scrubs and maestros:
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Your Federer example makes the opposite point to me. In his quote he says he can't hit a double-hander. Seems like he's doing it to win not because it's cool and avoiding a scrub heuristic of 'play like other people do'.
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The details are more complicated. He never tried using it, because he learnt the classic style first, and then his (ridiculous) talent allowed him to continue using the one-handed backhand in the modern game.
For the longest time, it was considered his biggest weakness.