Sean experienced many years of hardship with Antrim, one of the weaker footballing counties in Ireland but rose to prominence in 2000 when he was an outstanding performer in Antrim's first Ulster Championship win for 18 years.
World Rally Championship | World Championship | NCAA Men's Division I Basketball Championship | Ultimate Fighting Championship | World Championship Wrestling | Ulster | World Touring Car Championship | Six Nations Championship | County Championship | British Touring Car Championship | World Chess Championship | national championship | All-Ireland Senior Hurling Championship | Football League Championship | Extreme Championship Wrestling | Bowl Championship Series | Ulster Unionist Party | Championship | All-Ireland Senior Football Championship | 2005 World Touring Car Championship season | The Open Championship | World Sportscar Championship | 2010 FIBA World Championship | IMSA GT Championship | European Touring Car Championship | European Championship | World Snooker Championship | University of Ulster | PGA Championship | 2010 IIHF World Championship |
Although defeated after a replay by Down in the first round of the Ulster Championship, Tyrone emerged as victors in the 2008 All-Ireland Senior Football Championship, beating Kerry in the 2008 All-Ireland Senior Football Championship Final.
There was no entry from the Ulster Championship to the 2010 All-Ireland Senior Hurling Championship proper.