YOU SAID:
I am the best player to have ever played sports
INTO JAPANESE
私はこれまでスポーツをした中で最高の選手です
BACK INTO ENGLISH
I'm the best player I've ever played in sports
INTO JAPANESE
私は今までスポーツでプレーした中で最高の選手です
BACK INTO ENGLISH
I'm the best player I've ever played in sports
That didn't even make that much sense in English.