Novak Djokovic faced an unusual drugs test at the Rogers Cup tournament in Montreal.
The world's best tennis player complained to an umpire that his game was being affected by the smell of marijuana during the semifinal win against Jeremy Chardy.
"Someone is smoking weed - I can smell it and I'm getting dizzy," he told the umpire.
After the match, Djokovic said:" You can't believe how bad it was. Whoever it is, he's pretty high and I hope he doesn't come back tomorrow."
Marijuana is legal in Montreal, for medical use only.
Djokovic reckoned something similar happened during a doubles match earlier in the tournament.
