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off (one's) game
Unable to perform as well as usual. She never misses that shot. She must be off her game today. Staying up late last night really put me off my game at work.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*off one's game
Fig. not able to play a sport as well as normal. (*Typically: be ~; put one ~; throw one ~.) I'm a little tired, and that generally puts me off my game.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.