The bat used in playing tennis and related games is either a racket or a racquet. Both forms are standard, so use either. However, the game resembling squash is always rackets in British English but racquets in American English.
"racket vs. racquet." Grammar.com. STANDS4 LLC, 2023. Web. 23 Sep. 2023. <https://www.grammar.com/racket_vs._racquet>.
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