Shelbourne have shot into an early lead at the top of the Eircom Premier League with a four nil drubbing of Waterford United
A David Crawley penalty got the Dubliners on their way before veteran Stephen Geoghegan doubled the lead after 32 minutes.
The tie was all but wrapped up a minute before half time when new signing Jason Byrne added a third and the striker's second on 75 minutes left newcomers Waterford shell-shocked.
Defending champions Bohemians got their season off to a winning start with their only goal against UCD at Dalymount coming from the familiar source of Glen Crowe.
Crowe struck after 35 minutes to condemn the students to an opening day defeat.
At Richmond Park it ended honours even between Shamrock Rovers and Drogheda United after they played out a scoreless draw.
In the Eircom League First Division Bray Wanderers defeated Monaghan United by two goals to one.