Donegal’s Mark English recorded a new personal best of one minute 45.32 seconds to set a track record for the 800 metres at the Morton Games in Santry on Wednesday evening.
His huge run was just 0.02sec outside the A standard for the world championships.
Kildare's Paul Robinson also put in the performance of his life in the 800m to claim fourth in a new lifetime best of 1:45.86.
Reflecting on his victory, English said: “I just felt great out there tonight.
“I had a real burst of energy on the second lap and felt heavenly coming down the home straight. I'm just pleased after the disappointment of last week at the Euro Under-23 Championships.”
There was also a new track record in the women's mile when America's Brie Felnagle just held off Canadian Hilary Stellingwerff, prevailing in a magnificent 4:30.44.
The men's 400m hurdles was a top class field, with Ireland's recent European Under-23 finalist Thomas Barr (Ferrybank AC) leading early and clocking a winning time of 50.04.
The Albie Thomas men's 3000m went the way of Mexican Juan Luis Barrios in a very fast 7:45.12.
Ireland international Jen Carey looked smooth and relaxed in taking the 400m in a comfortable 52.98 from an outside lane from Britain's Gemma Nicol.
The women's 100m was a close-run race, with Waterford's sprint and long-jump specialist Kelly Proper crossing the line first from in 11.75. South Africa's Carina Horn filled the runner-up berth, while Irish record holder Ailis McSweeney was third.
Spain’s naturalised Ukrainian Igor Bychkov set a new stadium of 5.56m in the pole vault ahead of Britain’s Luke Cutts and America’s Jeff Coover.
American Cory Leslie landed the Morton Mile in 3:55.85 from compatriot Duncan Philips, with Juan Luis Barrios of Mexico third.