Born in Vinnytsia, Krevsun grew up around the track as her family was heavily involved in sports; her mother Militina Moskvina was an 800 m runner while her father, Yuriy Gurtovenko, was a talented shooter. Initially starting out as a 10 kilometres athlete, she switched to the 800 m in 1997. The family lived in poverty, affecting her athletics career, but she was invited to attend the Donetsk Sport College in 1998 and met Serhiy Krevsun, an amateur boxer, whom she would later marry.
At her first major junior tournament she won the silver medal, setting a new 800 m personal best of 2:03.81 at the 1999 European Athletics Junior Championships. She competed at the European Athletics U23 Championships in 2001, finishing in fifth place. Krevsun came second at the 2001 national championships, and won the competition in 2002. That year, Krevsun competed at the European Cup, and competed at the European Athletics Championshipsfor the first time, but did not progress beyond the heats. She represented Ukraine at the 2003 World Championships, but again lost in the heats. She grew dissatisfied with athletics in the 2003 and 2004 seasons, and she decided to start a family instead; her first son, Danil, was born in 2005. Reflecting on the situation she said "I was dissatisfied and decided to put an end to my athletics career. I wanted a quiet life, romantic dinners with my husband, and a baby’s laugh in our home."
Return to the track
In late 2005 she felt the urge to return athletics, juggling her training and caring for her son. A loss to Nataliya Tobias at the 2006 national championships inspired her to restart her professional career and she began training with Iryna Lishchynska. She was happy with her improving times but suffered a narrow exit in the semi-finals at the 2007 European Athletics Indoor Championships. The outdoor season in 2007 proved to be a turning point however; she took the silver medal at the 2007 European Cup and set new 400 metres and 800 metres personal bests. She ran the 800 m under two minutes for the first time at the national championships, winning in 1.59.60 seconds. Further improvements came shortly afterwards at the 2007 Summer Universiade where she won the gold medal, setting a world-leading time of 1.57.63 seconds. The pressure to compete at the 2007 World Championships as world-leader proved too much for Krevsun, and she was knocked out in the heats with a below-par 2.02.45 minutes. However, at the end of the season she was still the fifth fastest 800 m athlete that year. After strong performances in the 800 m at the 2008 IAAF Golden League meets, including beating World ChampionJaneth Jepkosgei, she gained self-confidence and focused on competing at the 2008 Summer Olympics. She ran a personal best of 1:57.32 in the qualifiers at the Beijing Olympics and reached her first Olympic final, eventually finishing in seventh position in the 800 m final. She started the 2009 season well with a win at the inaugural European Team Championships, setting a world-leading time of 1:58.62 and fending off fast performances from Yekaterina Kostetskaya, Élodie Guégan and Hannah England. She competed for Ukraine at the 2009 World Championships, finishing fourth in the 800 metres final, although winner Caster Semenya was asked to take a gender test.
Personal life
Krevsun completed a course in foreign economic management at the University of Management and Administrative Department in 2007; her studies enabled her to enter the 2007 Summer Universiade.
