The 23-year-old Polish player tested positive for the banned substance trimetazidine (TMZ) in an out-of-competition sample collected in August 2024. The ITIA determined that the positive result was due to contamination from a regulated non-prescription medication (melatonin) that Swiatek had been using to address jet lag and sleep difficulties.
Consequently, the agency concluded that the violation was not intentional, and Swiatek's level of fault was assessed to be at the lowest end of the spectrum for "No Significant Fault or Negligence."
Swiatek, who has secured five Grand Slam titles, accepted the one-month suspension. She had been provisionally suspended from September 22 to October 4, which resulted in her missing three tournaments that count towards the sanction, leaving her with eight days remaining.
Additionally, she will forfeit prize money from the Cincinnati Open, the event immediately following her positive test, where she was defeated by world number one Aryna Sabalenka in the final.