Here is what I think: " I used to play tennis" means "I played tennis once" (and most probably don't play it anymore). It's like to say "I used to live in Brooklin when I was a child" "I was used to play tennis" is grammatically incorrect. I would say: "I was used to play ing tennis".
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everlastinghopeis there any difference between " I used to play tennis and I was used to play tennis?There is also I was used to playing tennis, and there is a big difference between them. Each of the three means something different.