By Sam Blacker on SwimSwam
2025 World Junior Swimming Championships
August 19-24, 2025 Otopeni, Romania LCM (50 meters) Meet Central Meet Packet Team Leaders’ Guide SwimSwam Event Page SwimSwam Preview Psych Sheets Live Results Live Recaps Prelims: Day 1 | Day 2 | Day 3 | Day 4 Finals: Day 1 | Day 2 | Day 3 | Day 4DAY 5 PRELIMS HEAT SHEET
Welcome to Day 5 of the 2025 World Junior Championships! After last night’s final session, where we saw Great Britain’s Filip Nowacki win the 200 boy’s breaststroke in a time faster than won the senior world title in Singapore earlier this summer, we’re in for another short prelims session yet with just seven events this morning and only three longer than 100 meters. Let’s take a look at this morning’s lineup.
DAY 5 PRELIMS SCHEDULE:
Boys 100 Freestyle Girls 100 Butterfly Boys 400 IM Girls 50 Freestyle Boys 50 Breaststroke Girls 4×100 Freestyle Relay Girls 1500 Freestyle (slower heats)There are a pair of frontrunners in the men’s 100 freestyle to kick off the morning, with Jacob Mills and Carlos D’Ambrosio separated by just a tenth but more than half a second ahead of the third seed Tajus Juska.
They took silver and bronze respectively in the 50 last night, while D’Ambrosio continued his great form from worlds with a new Italian Record and gold medal in the 200 freestyle. They are also the only two to have split under 48 seconds on a relay here in Otopeni.
The World Junior Record holder in the 100 fly, Mizuki Hirai, will aim to make a statement in that event after taking silver by just three-hundredths in the 50 last night. With her entry time of 56.33, she leads a pair of Americans by more than 1.5 seconds, with Audrey Derivaux (57.99) and Charlotte Crush (58.09) taking lane 4 in the other two circle-seeded heats.
Despite being the World Junior Record holder, Yumeki Kojima only comes into the boy’s 400 IM as the 3rd seed, entered eight seconds slower than his best time in 4:17.42. Local favorite Robert Andrei Badea is the top seed in 4:14.37, a mark which stands as the Romanian Record, with Raito Numata (4:15.90) making it two Japanese swimmers in the top three entrants.
Numata took bronze in the 200 free earlier this week, and anchored the 4×200 free relay last night in 1:45.93 – faster than any flying split on Japan’s relay at the senior world championships.
There are three swimmers entered under 25 seconds in the women’s 50 free, and they are separated by just five-hundredths of a second. Rylee Erisman, who had three huge swims in the 100 free which culminated in a stunning 52.79 in the final that puts her on the Pan Pacs team for next summer, is the joint-top seed in 24.62 alongside compatriot Annam Olasewere, with Croatia’s Virginia commit Jana Pavlovic just behind in 24.67.
Rikako Ikee and Olivia Wunsch‘s Championship record of 24.59 could well be in danger here, with Erisman setting a championship record in all three rounds of the 100 free and looking in great form.
Filip Nowacki and Shin Ohashi will lock horns again in the 50 breast, but it is Turkey’s Nusrat Allahverdi who is the top seed in 27.16. Max Morgan could also be a threat after he broke the British 17-year-old record on his split in the 100 final on day 2, clocking 27.41 on his way to taking bronze.
We then move onto the girls’ 4×100 free relay, where the U.S. will look to claim lane 4 for tonight as they hunt just their second relay gold of the meet.
Finally, we will have the slower two heats of the women’s 1500 freestyle, ahead of the final heat of this heat-defined winner event being swum in tonight’s finals session.
BOYS 100 FREESTYLE – PRELIMS
World Record: 46.40 – Pan Zhanle, CHN (2024) World Junior Record: 46.86 – David Popovici, ROU (2022) Championship Record: 47.07 – David Popovici, ROU (2022)TOP 16 QUALIFIERS:
GIRLS 100 BUTTERFLY – PRELIMS
World Record: 54.60 – Gretchen Walsh, USA (2025) World Junior Record: 56.33 – Mizuki Hirai, JPN (2024) Championship Record: 57.25 – Rikako Ikee, JPN (2017)TOP 16 QUALIFIERS:
BOYS 400 IM – PRELIMS
World Record: 4:02.50 – Leon Marchand, FRA (2023) World Junior Record: 4:09.38 – Yumeki Kojima, JPN (2025) Championship Record: 4:10.97 – Tomayuki Matsushita, JPN (2023)TOP 8 QUALIFIERS:
GIRLS 50 FREESTYLE – PRELIMS
World Record: 23.61 – Sarah Sjoestrom, SWE (2023) World Junior Record: 24.17 – Claire Curzan, USA (2021) Championship Record: 24.59 – Rikako Ikee, JPN (2017) / Olivia Wunsch, AUS (2023)TOP 8 QUALIFIERS:
BOYS 50 BREASTSTROKE – PRELIMS
World Record: 25.95 – Adam Peaty, GBR (2017) World Junior Record: 26.97 – Nicolo Martinenghi, ITA (2017) Championship Record: 26.98 – Felix Victor Iberle, IDN (2023)TOP 8 QUALIFIERS:
GIRLS 4×100 FREESTYLE RELAY – PRELIMS
World Record: 3:27.96 – AUS (2023/) World Junior Record: 3:36.19 – CAN (2017) Championship Record: 3:36.19 – CAN (2017)TOP 8 QUALIFIERS:
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