World number one Novak Djokovic's US Open disqualification was "no doubt the right decision", says former British number one Tim Henman.
The Serb, 33, was defaulted after striking a line judge with the ball in Sunday's fourth-round match against Pablo Carreno Busta in New York.
After a lengthy discussion, he was defaulted by tournament officials.
Henman told Amazon Prime: "He was not aiming for the official, but you're responsible for your actions."
He added: "There was no other consequence.
"We saw a couple of points earlier when he whacked the ball into the advertising hoardings. He was frustrated."
Henman was 20 when he was disqualified from Wimbledon in 1995 for a similar incident, where he accidentally struck a ball girl during a men's doubles match.
Djokovic showed his frustration after losing serve to trail 6-5 against Spain's 20th seed Carreno Busta, taking a ball out of his pocket and hitting it behind him, striking the female line judge in her throat.
Henman added: "It's amazing for me to talk about this. It was a moment of frustration for me too - I hit the ball away when I wasn't looking and I hit a ball girl."
There was another incident more recently when, in 2017, Canada's Denis Shapovalov was defaulted from a decisive Davis Cup rubber with Britain's Kyle Edmund for hitting the ball in anger and striking the umpire in the face.