The chair umpire is the final authority on all questions of fact during the match.

From this position, the chair umpire calls the score of the match to the players and spectators between points.

Williams, who had asked the chair umpire to stop the match, looked relieved.

But she and other chair umpires need a refresher course in common sense.

The two players had to be separated by the chair umpire.

The original plan had been for the chair umpire to make those calls.

The issue is that there even is a chair umpire.

But chair umpires have the last word and they are using it more these days: "default."

Only it wasn't the same chair umpire at all.

"I didn't get angry with the chair umpire," he said.