World No1 Novak Djokovic refused to undergo a anti-doping test 90 minutes before beating Great Britain’s Cameron Norrie in a Davis Cup match in Malaga last week

Tennis bosses have been urged to suspend Novak Djokovic after he refused to be tested by an anti-doping official ahead of a Davis Cup match against Britain’s Cameron Norrie.

Djokovic helped Serbia knock out Great Britain in the quarter-finals of the competition on Thursday in Malaga. The pumped-up world No1 beat Norrie 6-4, 6-4 to send Serbia into the next round after refusing to provide a sample in a random drugs test 90 minutes before the match.