Just saw US nationals.
Liang vs Gal, 6th game, 9-10
Liang was busy hitting a shot that goes off, so 9-11
but a ball comes in, and Liang raise his hand (could argue the point was in progress, near over)
any ways, Liang isn't happy, as Umpire didn't notice that ball
Liang left the court, and called someone important (looks like referee)
referee spoke to umpire, tick, tock tick tock,
and that someone had someone else coming in, now 3 people talking
After few minutes, 4 people there talking (there having a board meeting maybe)
Then umpire was removed, another umpire replaced him, and someone big stood behind the umpire
So after a LONG break, the match continued in the decider. that point counted and now there is a new umpire and the referee....
All because, "This ball" came into the court, and the umpire didn't see it.
Some times a replay saves a lot of trouble to decide what is fair and what is not.