Ok fair enough, I get being disappointed, I would be too, but why boo the player? What control does he have over the injury? It’s like Novak purposely injured himself to spite the fans. It’s unfortunate but it’s nobody’s fault.I think 3rd reason, fans were angry they paid all that money and it was over so quickly. Crowd actually seemed to be favoring djokovic prior to that which is somewhat rare
As a fan, you gotta know that there is always a chance a player can get injured and there are no subs to come in and replace him. That’s the risk you take when you buy a ticket. There are no guarantees you will get an epic 5 setter just because you paid 100s of $. Only expectation should be that the players give it their best effort.