LONDON: Five-time Grand Slam champion Iga Swiatek accepted a one-month suspension after testing positive for the banned substance trimetazidine, a heart medication known as TMZ, the International Tennis Integrity Agency announced Thursday.

Swiatek failed an out-of-competition drug test in August, and the ITIA accepted her explanation that the result was unintentional and was caused by the contamination of a nonprescription medication, melatonin, that Swiatek was taking for issues with jet lag and sleeping.

It was determined her level of fault was “at the lowest end of the range for no significant fault or negligence,” the ITIA said.

This is the second recent high-profile doping case in tennis: The top-ranked man, Jannik Sinner, failed two tests for a steroid in March and was cleared in August, right before the start of the US Open, which he went on to win for his second Grand Slam title of the season.