Justyna Święty-Ersetic (; née Święty, born 3 December 1992) is a Polish sprinter specialising in the 400 metres. 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.
Career 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 × 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.
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.
She also competed for Poland at the 2024 Summer Olympics.
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).
Personal bests 200 metres – 23.81 (+0.4 m/s, Inowrocław 2014) 400 metres – 50.41 (Berlin 2018) 400 metres indoor – 51.04 (Toruń 2022) Relays 4 × 400 metres relay – 3:20.53 (Tokyo 2021) 4 × 400 metres relay indoor – 3:26.09 (Birmingham 2018) 4 × 400 metres relay mixed – 3:09.87 (Tokyo 2021) European record
Competition record 2009World Youth ChampionshipsBrixen, Italy6thMedley relay2:10.012010World Junior ChampionshipsMoncton, Canada8th relay3:38.96 2011European Junior ChampionshipsTallinn, Estonia2nd relay3:35.352012European ChampionshipsHelsinki, Finland19th (h)400 m53.688th relay3:30.17Olympic GamesLondon, United Kingdom13th (h) relay3:30.152013European U23 ChampionshipsTampere, Finland3rd400 m52.221st relay3:29.74World ChampionshipsMoscow, Russia9th (h) relay3:29.752014World Indoor ChampionshipsSopot, Poland4th400 m i52.205th relay i3:29.89World RelaysNassau, Bahamas5th relay3:27.37European ChampionshipsZürich, Switzerland13th (sf)400 m52.855th relay3:25.732015European Indoor ChampionshipsPrague, Czech Republic9th (sf)400 m i53.533rd relay i3:31.90World RelaysNassau, Bahamas5th relay3:29.30UniversiadeGwangju, South Korea6th400 m52.441st relay3:31.98World ChampionshipsBeijing, China15th (h) relay3:32.832016World Indoor ChampionshipsPortland, United States5th400 m i52.462nd relay i3:31.15European ChampionshipsAmsterdam, Netherlands6th400 m51.964th relay3:27.60Olympic GamesRio de Janeiro, Brazil17th (sf)400 m51.627th relay3:27.282017European Indoor ChampionshipsBelgrade, Serbia3rd400 m i52.52 1st relay i3:29.94World RelaysNassau, Bahamas2nd relay3:28.28World ChampionshipsLondon, United Kingdom44th (h)400 m53.623rd relay3:25.41UniversiadeTaipei, Taiwan1st relay3:26.752018World Indoor ChampionshipsBirmingham, United Kingdom4th400 m i51.852nd relay i3:26.09European ChampionshipsBerlin, Germany1st400 m50.41 1st relay3:26.592019European Indoor ChampionshipsGlasgow, Scotland6th400 m i52.64 1st relay i3:28.77World RelaysYokohama, Japan1st relay3:27.49European Team Championships Super LeagueBydgoszcz, Poland1st400 m51.231st relay3:24.81 World ChampionshipsDoha, Qatar7th400 m50.952nd relay3:21.892021European Indoor ChampionshipsToruń, Poland2nd400 m i51.41European Team Championships Super LeagueChorzów, Poland1st relay3:26.37 ELOlympic GamesTokyo, Japan2nd relay3:20.53 1st mixed3:09.87 2022World Indoor ChampionshipsBelgrade, Serbia4th400 m i51.403rd relay i3:28.59World ChampionshipsEugene, United States10th (h) relay3:29.344th mixed3:12.31 European ChampionshipsMunich, Germany17th (sf)400 m52.172nd relay3:21.68 SB2024World Indoor ChampionshipsGlasgow, United Kingdom8th (h)4 × 400 m relay3:28.80World RelaysNassau, Bahamas2nd4 × 400 m relay3:24.71European ChampionshipsRome, Italy17th (sf)400 m52.166th (h)4 × 400 m relay3:25.59 Olympic GamesParis, France7th (rep)400 m50.8910th (h)4 × 400 m relay3:26.692025European Indoor ChampionshipsApeldoorn, Netherlands5th400 m51.59World Indoor ChampionshipsNanjing, China5th400 m51.972nd4 × 400 m relay3:32.05World RelaysGuangzhou, China7th (heats)4 × 400 m mixed3:12.70 3rd (repechage)4 × 400 m relay3:24.56 European Team Championships, First DivisionMadrid, Spain1st4 × 400 m mixed3:09.43 , , World ChampionshipsTokyo, Japan31st (h)400 m51.805th4 × 400 m relay3:22.914th4 × 400 m mixed3:10.632026World Indoor ChampionshipsToruń, Poland15th (h)400 m52.154th4 × 400 m relay3:26.173rd4 × 400 m mixed3:17.44
Personal life In September 2017, she married Polish wrestler Dawid Ersetic.
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