Tokyo 2020 Olympian Daniel Wiffen became the first Irish swimmer to swim the 1500m freestyle in less than 15 minutes when clocking 14:48.24 at the FINA World Cup final in Budapest.
The performance earned the 20-year-old fourth overall in the event, his time just 0.09s slower than the time Austrian, Felix Auboeck, posted to finish on the podium in third.
It also lowered the Irish senior record of 15:00.88 that Andrew Meegan set in the 25m pool in 2013 - and means Wiffen now holds the national senior records for long course (50m) 800m and 1500m and short course (25m) 800m and 1500m.
The performance comes 24 hours after Wiffen set a big new personal best of 3:48.59 in 200m Freestyle.
Ireland's Maria Godden also hit a personal best in Budapest on Friday, shaving half a second off her previous best when swimming 2:00.57 in the 200m freestyle heats.
The Kilkenny swimmer also came close to a personal best in 100m backstroke, going 0.16s slower when clocking 1:00.79. She's back in the pool on Saturday for the 100m freestyle and 200m backstroke heats.
Wiffen's Saturday test will be 400m freestyle, and the pair will be joined on the final day of action in the Hungarian capital by Eoin Corby, who tackles the 200m breaststroke, having finished seventh in Thursday's 100m breaststroke final.