Ben Reynolds became the first Northern Ireland 110m hurdler to break the 14-second barrier as he clocked 13.98 seconds at Antrim on Saturday.
Reynolds took .14secs off the Northern Ireland record he set recently as he took the Northern Ireland title.
Other early winners at the Championships included Zoe Brown who took the pole vault with 3.80m - .20m ahead of Claire Wilkinson.
Ciara Mageean earned her expected routine victory in the women's 1500m.
The world junior silver medallist was a runaway winner in 4:23.07 which left her over 14 seconds clear of Julie Turley and her training partner Emma Mitchell.
Reynolds was delighted with his performance with earned him a £200 bonus for setting the new Northern Ireland record.
"I'm pretty pleased. With the weather conditions, I wasn't sure what it would be like," added Reynolds.
"I opened up quite badly (14.2) but I was ill that week but the week after I did Loughborough I did 13.81 with (a) 2.2 (wind) and that's when I knew I was in good shape so it was just a matter of executing."
Katie Kirk defended her women's 400m title as she held off Jo Patterson (55.90) to win in a personal best of 55.03.
Other winners included Irish walking star Colin Griffin who won the 3K event in 12:19.20 which left him almost three minutes ahead of Damien McAree.
With Stephen Colvert a late withdrawal from the championships, Dean Adams won the 100m in 10.87 while Daniel Mooney (3:51.72) won the 1500m ahead of Conor Bradley (3:51.95) and James O'Hare (3:59.94).