By Anya Pelshaw on SwimSwam
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 Live Recaps Finals: Day 1| Day 2 | Day 3 Prelims: Day 2 | Day 3MEN’S 100 FLY – Finals
World Record: 49.45, Caeleb Dressel (USA) – 2021 U.S. Open Record: 49.76, Caeleb Dressel (USA) – 2021 U.S. Open Meet Record: 50.78, Shaine Casas (USA) – 2023 Texas Pool Record: 50.78, Shaine CasasTop 8 Finishers
Shaine Casas (TXLA) – 50.24 CR Ilya Kharun (UN-AZ) – 50.40 Leon Marchand (TXLA) – 51.20 Caeleb Dressel (SJAC) – 51.33 Hubert Kos (TXLA) – 51.72 Bjoern Kammann (TNAQ) – 51.95 Dare Rose (SCAR) – 52.06 Aiden Hayes (NCS) – 52.68After breaking the US Open meet record in prelims, Shaine Casas swam to another record tonight posting a 50.24 in the men’s 100 butterfly. Casas also becomes the #9 performer all-time in the event.
Split Comparison
2025 US Open – Finals 2025 U.S. Open- Prelims 2023 U.S. Open 50 23.22 23.37 23.6 100 27.02 27.41 27.43 Total 50.24 50.78 51.03Casas was faster tonight than he was this morning on both 50s, although the 2nd 50 was a bigger difference than the first 50. He has been under the 51-second mark seven times in his career now.
With his swim tonight, Casas also moves up to become the #9 performer all-time. He previously sat tied as the #11 performer all-time with his previous best time of a 50.40 that he swam at 2022 Nationals. He is the 3rd fastest American all-time, only behind Caeleb Dressel and Michael Phelps.
All- Time Top Performers, Men’s LCM 100 Fly
Caeleb Dressel, 49.45 — 2020 Olympic Games Maxime Grousset, 49.62 — 2025 World Champs Kristóf Milák, 49.68 — 2020 Olympic Games Michael Phelps, 49.82 — 2009 World Champs Noe Ponti, 49.83 — 2025 World Champs Milo Cavic, 49.95 — 2009 World Champs Josh Liendo, 49.99 — 2024 Olympic Games Ilya Kharun, 50.07 — 2025 World Champs Shaine Casas, 50.24 – 2025 US Open Matthew Temple, 50.25 — Japan Open (50m) 2023Casas’ time tonight notably would have been 5th in finals at the 2025 World Championships. He did not advance to semifinals in the event after swimming a 51.66 for 19th during prelims.
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