US Open Tournament Referee Soeren Friemel said there was "no other option" but to disqualify world number one Novak Djokovic on Sunday after he struck a line judge with a ball.
Novak Djokovic said he was "sad and empty" after a being disqualified from the US Open on Sunday after hitting a line judge in the throat with a ball during his fourth-round match against Spain's Pablo Carreno Busta.
Djokovic urges angry fanbase not to turn on US Open line judge
World number one Novak Djokovic was sensationally disqualified in the US Open fourth round on Sunday after striking a line judge with a ball following a point during the first set of his match against Spain's Pablo Carreno Busta.