By Will Baxley on SwimSwam
See all of our 2025 Swammy Awards here
If you’re a frequent reader on this site, you’ve likely experienced the unmatched level of fatigue that creeps up at the end of a championship meet. No amount of training immunizes you from the difficulty of hijacking your body into an adrenaline state for the 10th time of the weekend, a hijack that your high lactic acid levels and lack of sleep fight against every inch of the way.
You may also be familiar with the fatigue that comes from cross-continental flights, and the zombie-like trance you enter while trying to adjust to a new time zone off a couple hours of shallow plane sleep.
Agostina Hein is surely intimately familiar with both of these feelings. At the end of her championship meet this summer, she immediately boarded a slew of planes from the southern tip of South America to Romania. Upon landing from the 24+ hour, 8,000- mile journey, Hein immediately began another meet. And she became a World Junior Champion.
The accumulation of 10 medals in 12 days on opposite sides of the world left no question as to who SwimSwam’s South American Female Swimmer of the Year would be. At 17 years of age, Hein’s grit shows she’ll be a force on the global stage for years to come.
The Buenos Aires native began her championship season at the 2025 Junior Pan American Games in Asunción, Paraguay. There, Hein went three for three in individual events: the 200 IM (2:12.12), 400 free (4:06.96), and 400 IM (4:38.41). She also aided the Albiceleste to silver in four relays, including both mixed relays and the women’s 4×100 medley and 4×200 free.
Hein’s coach, Seba Montero, said Hein only competed in three individual events to focus on relays and to save energy for her next meet.
“If we had done six (individual events), she would’ve won six,” the coach asserted to Latin American publication Infobae.
The choice paid off in a big way. With only four days between meets, Argentina’s newest star jetted off to Otonepi, Romania,, for the Junior World Championships. Google Flights says this journey takes a minimum of 24 hours and three different flights from Paraguay, and the time zones are five hours apart. On the first day of competition in Europe, Hein grabbed the 400 IM by the horns. She topped swimming’s decathlon in a new meet record of 4:34.34. This also shattered a 21-year-old South American record held by fellow Argentine Georgina Bardach.
The next event, the 800 free, was another medal for Hein. This time, she scored silver in 8:26.19.
Hein did not let her feet off the brakes for the rest of 2025. She returned to South America and competed in five more meets throughout the continent, breaking national record after national record along the way. In total, she broke Argentine marks at six different meets in the latter half of 2025. The teenager ends the year with national records in 10 individual events between long and short course.
Agostina Hein, 2025 Year-End World Rankings (LCM)
400 IM – 6th 800 free – 16th 400 free – 22nd 200 IM – 44th 200 free – 88thHonorable Mention
Stephanie Balduccini, Brazil – Balduccini is emerging as Brazil’s most talented female sprinter in a generation. She started her year off with a bang by swimming 53.87 to claim a national record in the long course 100 free. This came at Brazil’s national qualification meet, where she also became the country’s #2 all-time 200 free performer (1:56.43). The Michigan-trained athlete kept the momentum going with a semifinal appearance and 13th-place finish in the 200 freestyle in Singapore. She ended her long course season as strong as ever, cranking out a meet-leading seven golds at the 2025 Pan American Games.Previous Winners
2024 Swammy – Maria Fernanda Costa, Brazil 2023 Swammy – Macarena Cabellos, Argentina 2022 Swammy – Jhennifer Conceicao, Brazil 2021 Swammy – Viviane Jungblut, Brazil 2020 Swammy – Julia Sebastian, Argentina 2019 Swammy – Delfina Pignatiello, Argentina 2018 Swammy — Julia Sebastian, Argentina 2017 Swammy — Etiene Medeiros, Brazil 2016 Swammy — Etiene Medeiros, Brazil 2015 Swammy — Ana Marcela Cunha, Brazil 2014 Swammy — Etiene Medeiros, Brazil 2013 Swammy — Poliana Okimoto, BrazilRead the full story on SwimSwam: 2025 Swammy Awards: South American Female Swimmer of the Year – Agostina Hein
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