2025 U.S. OPEN
- December 3-6, 2025
- Austin, Texas
- Lee and Joe Jamail Texas Swimming Center
- Prelims: 10 a.m. EST
- Finals: 7 p.m EST (Day 1: 5 p.m. EST)
- LCM (50 meters)
- Meet Central
- Psych Sheets
- Live Results
Shaine Casas wasted no time in opening day 3 prelims at the 2025 US Open Championships with a bang, breaking his own meet record in the 100 butterfly.
Racing in the final heat of the morning alongside teammate Leon Marchand, Casas threw down a time of 50.78, erasing his 2023 meet record of 51.03 by just over .2 seconds. Notably, this marks the first time that the meet record has been taken under the 51-second barrier, though the meet isn’t contested in LCM every year. Ilya Kharun also dipped under the previous meet record with his 50.91 swim in the heat before Casas.
Split Comparison, Shaine Casas 100 Butterfly US Open Championships Records:
| 2025 U.S. Open Championships |
2023 U.S. Open Championships
|
|
| 1st 50 split | 23.37 | 23.6 |
| 2nd 50 split | 27.41 | 27.43 |
| Total | 50.78 | 51.03 |
The key difference for Casas was his opening 50 compared to his 2023 swim, which was nearly .3 seconds faster. Though he only closed .02 seconds faster on the 2nd 50 of the race, his gap was enough to break the record, with the potential to elipse it again tonight.
For Casas, this marks his 6th swim under the 51-second barrier, with his personal best of 50.40 established back in July 2022. Prior to this, he most recently broke the barrier at the US National Championships back in June, where he won the 100 butterfly in a time of 50.51.
Originally reported by James Sutherland
MEN’S 100 FLY – PRELIMS
- World Record: 49.45, Caeleb Dressel (USA) – 2021
- U.S. Open Record: 49.76, Caeleb Dressel (USA) – 2021
U.S. Open Meet Record: 51.03, Shaine Casas (USA) – 2023
‘A’ Final Qualifiers:
- Shaine Casas (TXLA), 50.78
- Ilya Kharun (UN-AZ), 50.91
- Dare Rose (SCAR), 51.60
- Caeleb Dressel (SJAC), 51.77
- Leon Marchand (TXLA), 51.81
- Bjoern Kammann (TNAQ), 51.94
- Hubert Kos (TXLA) / Aiden Hayes (NCS), 52.30
- –
Shaine Casas and Ilya Kharun threw down back-to-back sub-51 swims to lead a hotly contested prelim in the men’s 100 fly.
Casas roared to victory over teammate Leon Marchand in the penultimate heat, clocking 50.78 to break his own U.S. Open meet record of 51.03 set in 2023. The swim also moves Casas into #1 in the world this season, overtaking Aussie Matt Temple (50.92).
The swim stands up as the sixth sub-51 performance of Casas’ career, with his personal best standing at 50.40 from July 2022.
Marchand touched 2nd in the heat in 51.81, lowering his previous best of 52.42 to qualify 5th into the final.
In the last heat, Kharun answered Casas by blasting to a time of 50.91, delivering the only sub-27 second 50 (26.88) on the way as he qualifies 2nd for the final and moves to #2 in the world this season.
Dare Rose touched 2nd in 51.60, good for 3rd overall, while Caeleb Dressel delivered his fastest swim since the Paris Olympics in 51.77 to qualify in 4th. Dressel had only raced the 100 fly twice since the 2024 Olympics, clocking 53.11 and then 52.33 in July at the Florida Senior Championships.
- Dressel’s Splits: 24.42/27.35
Tennessee’s Bjoern Kammann topped the first circle-seeded heat in 51.94 to make the final in 6th. The German native set a PB of 51.70 this past summer en route to winning silver at the World University Games.
Owen McDonald was disqualified for a false start after initially posting a time in the 52-mid range.
