Darren Moore, who is in his 40s, suffered multiple fractures and cuts to his face when he was attacked at the pub in Doagh last month.
The 19-year-old man was arrested in Ballyclare and has been taken to Antrim police station for questioning.
A number of men have already appeared in court, charged with the murder bid.
A man has been arrested on suspicion of attempted murder over a gang attack in a County Antrim bar in which the victim was beaten with hammers and bats.