William Dunlop edges out brother Michael in Armoy opener
William Dunlop started the Armoy meeting with victory by just 0.007 seconds from his brother Michael in Friday night's Supersport race.
Derek Shiels completed the podium after a thrilling finish between the Ballymoney siblings.
William Dunlop has now won the race for a third straight year and it gives him a boost ahead of the 10-race programme on Saturday.
The event, held over a three-mile circuit, is now in its eighth year.
William Dunlop will ride Yamaha machinery in the Open and Supersport classes, plus the feature 'Race of Legends' event.
The 25 entries for the 125cc/Moto3 class include Manxman Dan Sayle, Derek McGee and Sam Wilson on the Joey's Bar Hondas, Gary Dunlop, Paul Robinson and Sam Dunlop.
Roads close on on Saturday from 10:00 BST to 19:30 at the latest.
Armoy race schedule
Saturday 30 July - Junior Support; Moto3/125cc; Supersport race two; Junior Classic; Open Race; 250cc; 400cc; Supertwins; Senior Support; Race of Legends