As Jannik Sinner nears the end of a three-month doping ban that shook the tennis world, players are flocking to anti-doping authorities seeking advice on how to avoid positive tests due to contamination.

Jannik Sinner was considering taking a break from tennis earlier this year before he accepted a three-month ban in a settlement with the World Anti-Doping Agency.

Jannik Sinner said he “didn’t feel at ease” during the Australian Open in January and considered taking a break from tennis after he was sanctioned for two anti-doping violations.