WordNet (r) 3.0 (2006):

misplay
    n 1: (baseball) a failure of a defensive player to make an out
         when normal play would have sufficed [syn: error,
         misplay]
    v 1: play incorrectly, e.g., play a wrong note
    2: play wrong or in an unskillful manner

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "misplay":
   clerical error, corrigendum, do amiss, erratum, error, failure,
   fault, faute, human error, misapply, misapprehension,
   miscalculation, miscall, miscarriage, miscite, misconception,
   misconduct, miscount, misdeal, misemploy, misfield,
   misidentification, misjudgment, mismanage, misprint, misquotation,
   misquote, misread, misreport, miss, misspell, misstatement,
   mistake, misunderstanding, misuse, typo, typographical error