From Openwaterpediaprofessional marathon swimmer. She finished 9th in the 2011 FINA 10KM Marathon Swimming World Cup series and is considered to be one of the fastest improving swimmers on the world-class level. She is competing on the 2012 FINA 10KM Marathon Swimming World Cup circuit and qualified for the Olympic 10km Marathon Swim at the 2012 London Olympics where she placed 7th.
She is coached by her father Aleksandr Andreevich Beresnyev.
Beresnyeva made her debut at the 2000 Olympic Games, at the age of 15. After representing Ukraine at the 2004 Olympic Games, Beresnyeva migrated to Israel. After failing to qualify for the 2008 Beijing Olympics Beresnyeva returned to Ukraine. Originally a 800 meter freestyle swimmer she became a long-distance swimmer in 2008. Beresnyeva won the 25K open water race at the 2010 European Championships at her first ever race at that distance.
2011 FINA World Championships
Olga placed 15th (2:02:25.1) in the 2011 FINA World Championships in the 10K in Shanghai, China.
2012 Olympic Marathon Swim Results
GOLD Eva Risztov (HUN) 1:57:38.2
SILVER Haley Anderson (USA) 1:57:38.6
BRONZE Martina Grimaldi (ITA) 1:57:41.8
4. Keri-Anne Payne (GBR) 1:57:42.2
5. Angela Maurer (GER) 1:57:52.8
6. Ophelie Aspord (FRA) 1:58:43.1
7. Olga Beresnyeva (UKR) 1:58:44.4
8. Erika Villaecija (ESP) 1:58:49.5
9. Jana Pechanova (CZE) 1:58:52.8
10. Anna Guseva (RUS) 1:58:53.0
11. Melissa Gorman (AUS) 1:58:53.1
12. Karla Sitic (CRO) 1:58:54.7
13. Yumi Kida (JPN) 1:58:59.1
14. Yanel Pinto (VEN) 1:59:05.8
15. Natalia Charlos (POL) 1:59:58.7
16. Heidi Gan (MAS) 2:00:45.0
17. Cecilia Biagioli (ARG) 2:01:02.2
18. Zsofia Balazs (CAN) 2:01:17.8
19. Swann Oberson (SUI) 2:01:38.0
20. Wing Yung Natasha Terri Tang (HKG) 2:02:33.4
21. Lizeth Rueda Santos (MEX) 2:02:46.1
22. Marianna Lymperta (GRE) 2:04:26.5
Poliana Okimoto (BRA) DNF
Jessica Roux (RSA) DNF
Yanqiao Fang (CHN) DNS