Iga Swiatek, a self-described “control freak,” is taking new precautions — including holding on to extra samples of medicine she takes, in case they need to be tested at some point — after a doping case she described Friday as “probably, like, the worst time in my life.”

Swiatek failed an out-of-competition drug test in August, but her one-month suspension wasn’t known until late November, after she sat out three events without revealing why. By the time her case was announced by the ITIA — which accepted that her sample was tainted because of a contaminated sleep aid — all that was left for her to serve was a week, which landed in the offseason.