Bree shattered his Irish 100m breaststroke record on Thursday
Andrew Bree's heavy day one schedule eventually appeared to catch up on him at the European Short Course Championships in Dublin.
The Irish swimmer was unable to repeat his double-national record performances of the morning heats in the afternoon session.
In the morning Bree, using the 100m to tune up for his main event the 200m on Sunday, clocked a new Irish record of 59.98 which cut an amazing 1.62 seconds off his previous national mark.
However in the afternoon semi-final, his time of 1:00.26 left him 11th fastest - .27 slower than what was required to make the final.
Less than 15 minutes after his breaststroke semi-final, he was back in the pool in the 200m medley relay final and not surprisingly, his time of 2:03.06 left him eighth and last.
In the morning, Bree had been almost five seconds faster with a 1:58.42 clocking which cut almost .75 off his existing national record.
Despite his afternoon performances, Bree's swims on day one should give him huge confidence for his 200m breaststroke challenge on Sunday.
A new Irish record wasn't enough to earn Portstewart swimmer Emma Robinson a place in the final of the 50 metres breaststroke.
Robinson cut .10 off her existing mark by clocking 31.53 in the semi-finals.
That left her 10th fastest with only the top-eight making the final later in the afternoon.
Emma Robinson cut .10 off her existing Irish record
Earlier, Robinson had clocked 31.66 in the heats.
Ireland's Michael Williamson clocked 1:02.23 in the morning heats of the 100m breaststroke which was a personal best and he will look forward to joining Bree in Sunday's longer event.
City of Belfast swimmer Melanie Nocher failed to progress in the 100m backstroke heats.
Nocher's time of 1:04.26 left her down in 37th place - over five seconds behind fastest qualifier Antje Buschschulte of Germany.
Carrickfergus swimmer Julie Douglas and her Irish team-mate Chantal Gibney failed to qualify for the semi-finals of the 100m freestyle but had the consolation of producing personal bests.
Gibney and Douglas finished 34th and 35th after producing times of 55.98 and 56.04.
Ireland's Claire Hogan failed to qualify for the final of the 200m individual medley after finishing 30th fastest in the heats but she again managed a personal best of 2:11.75.
Irish duo Muiris O'Riada and Donal O'Neill failed to qualify for the 100m butterfly semi-finals.
O'Riada clocked 54.66 while O'Neill was timed at 55.41 which left them 34th and 37th.
Swimming in the 200m Butterfly, Cork swimmer, Lee Kelleher recorded a personal best tme of 2.11.75, putting her in 11th position overall while Sinead Tyrell clocked 2:20.07 in the same event.
Steven Manley clocked 3:52.46 in the 400m freestyle.
Irish competitors on Friday
Donal O'Neill (50m backstroke), Melanie Nocher (50m butterfly), Julie Douglas (50m butterfly), Lee Kelleher (100m IM), Claire Hogan (100m IM), Stephen Manley (100m freestyle), women's 4x50m freestyle relay.