Donegal's Mark English (UCD AC) smashed the Irish men's 800m indoor record on his seasonal bow at the Woodies DIY AAI Open Games at Athlone IT.
His new personal best of 1:46.82 broke Daniel Caulfield's 13-year-old national record of 1:47.21 and was also inside the 1:47 flat qualification mark for the World Indoors in Poland in March. English (20) finished second to the Netherlands' Thijmen Kupers (1:46.78).
West Waterford's David McCarthy also qualified for the World Indoors by setting a 3:39.14 PB when he was second in the 1500m, won by Jakub Holusa in a new Czech record of 3:38.79, with John Coghlan third in 3:43.31.
Ciara Everard (UCD), seeking the 2:03 World Indoor standard, opened her season with 2:04.69; she was second to Poland's Anna Roszkowska (2:04.01) in the 800m.
Cavan sprinter Craig Lynch (Shercock AC) went sub-seven (6.88) for the first time and left Steven Colvert (6.91) and David Hynes (6.92) in his wake in the 60m.
Amy Foster (City of Lisburn) ran her fastest season-opener ever to win the women's 60m in 7.40, with Phil Healy (Bandon) equalling her PB (7.43) in second ahead of DCH's Catherine McManus (7.59), who also won the hurdles.
DSD'S Sinead Denny (DSD) set a new stadium record with her 54.52 PB in the 400m and Dooneen's Timmy Crowe came within a hundredth of a second of his PB (47.97) in the men's equivalent.
Elsewhere, Kildare's Paul Robinson broke 14 minutes for the first time with 13:54.34 for 5000m in Hobart, Australia, where Leevale's Mark Hanrahan was also seventh in a new PB of 14:05.82.