Gulin, ranked No. 407, was leading 4-0 in the final set when he suddenly turned on the chair umpire, shouting vulgar language and making obscene gestures.

Instead of celebrating the point, Gulin pointed directly at the umpire and unleashed a series of obscene gestures, followed by a torrent of verbal abuse with vulgar words such as 'b {expletive} me'.

The clip lasted 14 seconds, presented by Turkish President Recep Tayyip Erdogan as proof that his rival in Sunday's election was running "hand in hand" with outlawed Kurdish militants.