Rio Olympics 2016: Alan Campbell wins opening Games heat
Coleraine rower Alan Campbell started his Olympic Games bid with a an easy single sculls heat victory in Rio.
The London 2012 bronze medallist led throughout to win in 7:08.31 minutes.
Campbell, who has become the first Northern Ireland athlete to compete in four Olympic Games, goes through to the quarter-finals on Tuesday.
Fellow Coleraine man Peter Chambers is through to the lightweight fours semi-finals after his crew finished second in their heat on Saturday.
Double Olympic rowing gold medalist and BBC analyst James Cracknell said: "The British fans were all on their feet to cheer Alan and he has not disappointed.
"When I spoke to him the other day, he was here for one medal - gold.
"He knows he can perform on the big stage after winning Olympic bronze in 2012 but he has to build some confidence after a couple of indifferent years."
Clare Abbott lies in a tie for 13th for Ireland following the dressage stage as she made her Olympic debut in the three-day eventing.
Hillsborough-based Abbott, who celebrated her 30th birthday last week, scored 47.00 on Europrince and 10 behind leader William Fox-Pitt of Great Britain.
There was disappointment for Ulster quartet Iain Lewers, David Ames, Ian Sloan and Mark Gleghorne as the Great Britain hockey team lost their first pool game 4-1 to Belgium.