Except for golf, hard to think of a sport that is better suited to return when the crisis abates than tennis. Agree that it may happen without fans, but if life returns to some degree of normalcy by June or even July, can see tennis and golf returning fairly soon thereafter. Those are individual sports, which require no physical contact, and since they are not team sports, an entire group of players aren't shut down if a single player test positive. Maybe, I'm far too optimistic, but my guess is that US Open will be played in late August/September, but probably without fans.
If there is no tennis or golf by August, there will be no sports for the rest of 2020.