Australian Open 2020

[Thryleon]

Why do they need perfect silence to serve? At local tennis they have cars driving past, kids walking dogs and talking to each other, planes flying overhead. Too precious to expect complete silence, you're getting paid millions, just block it out and get on with it

The tennis has always been about decorum and silence.  Very high brow and clapping.  It's always been a sport that takes itself seriously.  Possibly too seriously, and the fans have always traditionally been quietened down by the umpires.  They have been woeful at this of late.

The players have the right to expect that the fans are quiet.  Djokovic has never felt the love from the Australian supporters and frankly my experience growing up says it's a deep seeded racial thing to people who hail from the Balkan area.

It is very common for a player to halt their service motion and wait for silence prior to serving.  Add a timer and you have a recipe for time violation if one feels the noise is going on for too long and the umpire doesn't agree.  I'll remind you at this point that the umpire starts said timer.