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.
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"racket vs. racquet." Grammar.com. STANDS4 LLC, 2021. Web. 20 Jan. 2021. <https://www.grammar.com/racket_vs._racquet>.