Novak Djokovic has urged tennis authorities to be cautious about moving put microphones near tennis coaches for live television, saying it could "endanger" players and their tactics during matches.

Novak Djokovic added yet another record to his lengthy list, breaking a tie with Roger Federer for the most Grand Slam matches played in tennis history by reaching 430 on Wednesday at the Australian Open in what was a tougher-than-expected second-round victory.

Andy Murray and Novak Djokovic have been searching the Australian Open locker room for players who can provide them with inside information ahead of the Serbian’s matches. Djokovic, who appointed Murray as his coach last autumn, is on the hunt for a record-extending 25th men’s Grand Slam title at Melbourne Park.

Novak Djokovic and Carlos Alcaraz picked up wins Wednesday to advance to the third round of the Australian Open.

Novak Djokovic and his new coach, Andy Murray, are taking advantage of a new setup at the Australian Open that gives players' entourages a chance to sit right next to the court in special four-seat pods.