Antrim ran out comfortable 4-21 to 1-17 winners over Down in the much-delayed 2013 Ulster Senior Hurling final in front of 139 spectators at Celtic Park.
The match had originally been scheduled to take place on 7 July last year, before being moved to November, and eventually to this mid-winter date.
Down competed well for much of the game but tired late on as they fulfilled their second fixture in 24 hours.
The Mournemen lost to Kildare in a Kehoe Cup semi-final on Saturday.
Gareth Johnson suffered a suspected cruciate ligament injury during that game and will undergo a scan this week amid fears that he may be ruled out for the remainder of the season.
The Saffrons led from the start and enjoyed a 2-8 to 1-7 advantage at half-time with the help of goals from Ciaran Johnston and skipper Neil McManus.
A Danny Toner goal before the interval kept Down in touch and they trailed 2-12 to 1-12 with 20 minutes remaining, with Paul Sheehan scoring eight points in total.
Darren Hamill found the net for Antrim's second goal 22 minutes into the second half and Conor Johnston scored the fourth.
Down were reduced to 14 men when Conor O'Prey was shown a red card late in the game.