Michael Dunlop took three victories at Sunday's Walderstown Road Race meeting.
Dunlop won the main event - the Race of the South - from his brother William and Derek Sheils and set a new lap record of 107.79mph in the process.
The Ballymoney man also won the Open Race and 600 class while William won the 125 race at the event in Athlone.
Lisburn rider Darren Burns sustained a broken pelvis and Wayne Kennedy a punctured lung and broken ribs in the 250 race which was abandoned.
Michael Dunlop finished ahead of Michael Pearson and Sheils in the Open Race and edged out Sheils and Michael Sweeney in the 600 event as he took third second successive treble at the Walderstown meeting.
William Dunlop won the 125 event ahead of his cousins Paul Robinson and Sam Dunlop while Andy Farrell won the Supertwins race from John Burrows.