| Justyna Święty-Ersetic | |
| Birth Date: | 3 December 1992 |
| Birth Place: | Racibórz, Poland |
| Height: | 1.65 m[1] |
| Weight: | 57 kg |
| Country: | Poland |
| Sport: | Athletics |
| Event: | 400 metres |
| Club: | AZS-AWF Katowice[2] |
| Coach: | Aleksander Matusiński |
| Show-Medals: | yes |
Justyna Święty-Ersetic (pronounced as /pl/; born 3 December 1992) is a Polish sprinter specialising in the 400 metres.[3] She was the 2018 European champion and a two-time European Indoor Championship medallist in this event. Święty-Ersetic won many medals at major championships as part of Polish 4 × 400 m relays, including a gold in the mixed relay and a silver in the women's relay at the 2020 Tokyo Olympics.
She is multiple Polish national outdoor and indoor champion.
Justyna Święty-Ersetic competed in the 4 × 400 metres relay at the 2012 London and 2016 Rio Summer Olympics. She won the bronze medal at the 2017 World Championships in the event. At the 2018 European Championships in Berlin, she won an individual gold and later also anchored the Polish squad to the win despite the fact that both finals were separated by less than two hours.
At the 2020 Tokyo Olympics she represented Poland in the 4 x 400 m mixed relay, winning gold alongside Karol Zalewski, Natalia Kaczmarek and Kajetan Duszyński. A few days later, Święty-Ersetic anchored the women's 4 × 400 m relay (Kaczmarek, Iga Baumgart-Witan and Małgorzata Hołub-Kowalik), sealing a silver for the group.[4] [5]
In March 2022, Święty-Ersetic won for the second time World Athletics Indoor Tour in her specialist distance after her 2020 victory, breaking the meeting record in Madrid.[6]
Her personal bests in the 400 metres are 50.41 seconds outdoors (Berlin 2018), and 51.04 seconds indoors (Toruń 2022). She was part of teams which set national records for the women's and mixed relay (both Tokyo 2021), and women's indoor relay (Birmingham 2018).
| 2009 | World Youth Championships | Brixen, Italy | 6th | Medley relay | 2:10.01 | |
| 2010 | World Junior Championships | Moncton, Canada | 8th | relay | ||
| 2011 | European Junior Championships | Tallinn, Estonia | bgcolor=silver | 2nd | relay | 3:35.35 |
| 2012 | European Championships | Helsinki, Finland | 19th (h) | 400 m | 53.68 | |
| 8th | relay | 3:30.17 | ||||
| Olympic Games | London, United Kingdom | 13th (h) | relay | 3:30.15 | ||
| 2013 | European U23 Championships | Tampere, Finland | 3rd | 400 m | 52.22 | |
| bgcolor=gold | 1st | relay | 3:29.74 | |||
| World Championships | Moscow, Russia | 9th (h) | relay | 3:29.75 | ||
| 2014 | World Indoor Championships | Sopot, Poland | 4th | 400 m i | 52.20 | |
| 5th | relay i | 3:29.89 | ||||
| World Relays | Nassau, Bahamas | 5th | relay | 3:27.37 | ||
| European Championships | Zürich, Switzerland | 13th (sf) | 400 m | 52.85 | ||
| 5th | relay | 3:25.73 | ||||
| 2015 | European Indoor Championships | Prague, Czech Republic | 9th (sf) | 400 m i | 53.53 | |
| 3rd | relay i | 3:31.90 | ||||
| World Relays | Nassau, Bahamas | 5th | relay | 3:29.30 | ||
| Universiade | Gwangju, South Korea | 6th | 400 m | 52.44 | ||
| bgcolor=gold | 1st | relay | 3:31.98 | |||
| World Championships | Beijing, China | 15th (h) | relay | 3:32.83 | ||
| 2016 | World Indoor Championships | Portland, United States | 5th | 400 m i | 52.46 | |
| bgcolor=silver | 2nd | relay i | 3:31.15 | |||
| European Championships | Amsterdam, Netherlands | 6th | 400 m | 51.96 | ||
| 4th | relay | 3:27.60 | ||||
| Olympic Games | Rio de Janeiro, Brazil | 17th (sf) | 400 m | 51.62 | ||
| 7th | relay | 3:27.28 | ||||
| 2017 | European Indoor Championships | Belgrade, Serbia | 3rd | 400 m i | 52.52 | |
| 1st | relay i | 3:29.94 | ||||
| World Relays | Nassau, Bahamas | bgcolor=silver | 2nd | relay | 3:28.28 | |
| World Championships | London, United Kingdom | 44th (h) | 400 m | 53.62 | ||
| 3rd | relay | 3:25.41 | ||||
| Universiade | Taipei, Taiwan | bgcolor=gold | 1st | relay | 3:26.75 | |
| 2018 | World Indoor Championships | Birmingham, United Kingdom | 4th | 400 m i | 51.85 | |
| bgcolor=silver | 2nd | relay i | 3:26.09 | |||
| European Championships | Berlin, Germany | bgcolor=gold | 1st | 400 m | ||
| bgcolor=gold | 1st | relay | 3:26.59 | |||
| 2019 | European Indoor Championships | Glasgow, Scotland | 6th | 400 m i | 52.64 | |
| 1st | relay i | 3:28.77 | ||||
| World Relays | Yokohama, Japan | bgcolor=gold | 1st | relay | 3:27.49 | |
| European Team Championships Super League | Bydgoszcz, Poland | bgcolor=gold | 1st | 400 m | 51.23 | |
| bgcolor=gold | 1st | relay | ||||
| World Championships | Doha, Qatar | 7th | 400 m | 50.95 | ||
| bgcolor=silver | 2nd | relay | 3:21.89 | |||
| 2021 | European Indoor Championships | Toruń, Poland | bgcolor=silver | 2nd | 400 m i | 51.41 |
| European Team Championships Super League | Chorzów, Poland | bgcolor=gold | 1st | relay | 3:26.37 EL | |
| Olympic Games | Tokyo, Japan | bgcolor=silver | 2nd | relay | ||
| bgcolor=gold | 1st | mixed | 3:09.87 | |||
| 2022 | World Indoor Championships | Belgrade, Serbia | 4th | 400 m i | 51.40 | |
| 3rd | relay i | 3:28.59 | ||||
| World Championships | Eugene, United States | 10th (h) | relay | 3:29.34 | ||
| 4th | mixed | |||||
| European Championships | Munich, Germany | 17th (sf) | 400 m | 52.17 | ||
| bgcolor=silver | 2nd | relay | 3:21.68 SB | |||
| 2024 | World Indoor Championships | Glasgow, United Kingdom | 8th (h) | 4 × 400 m relay | 3:28.80 | |
| World Relays | Nassau, Bahamas | bgcolor=silver | 2nd | 4 x 400 m relay | 3:24.71 | |
| European Championships | Rome, Italy | 17th (sf) | 400 m | 52.16 | ||
| 6th (h) | 4 x 400 m relay |
In September 2017, she married Polish wrestler Dawid Ersetic.[7]