Andy Murray noticed Novak Djokovic hanging out with F1 star George Russell and figured out it was a perfect way to drop a hilarious joke, telling the Serb he was supposed to be practicing. When the record 24-time Grand Slam champion announced the newly retired Briton as his new coach for the Australian Open,

Andy Murray was quick to accuse Novak Djokovic of lacking discipline in a light-hearted way after the Serb took time away from the court to visit the Qatar Grand Prix. Stay up to date with all the big headlines, pictures, analysis, opinion and video on the stories that matter to you.

Although his career as a professional tennis player ended only a few months ago, Andy Murray has already found his next challenge. The former world No. 1 – who will also do a theatrical tour next year – will be Novak Djokovic's coach during the upcoming Australian Open.