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factually true shoota, but you can't go round lashing out and causing the injury of an official. I agree with the comments about making amends immediately and he should have asked for a microphone asap and before the presentation to give his opponent the honour that he was due.
Queens/ATP were poor in not explaining that the incident merits immediate disqualification in the rule book, no exemptions for that sort of behaviour.
Hope the old guy is ok - that did look like a nasty gash/cut. The only thing that didn't make it an assault was that Nalbandian obviously targeted the board and the accident was secondary - however, what a plonker as he surely must have known that there wasn't much space between the board and the line judge and that the board would collide into the victim, whatever. If he didn't, he needs anger management as part of his fine/ban.