She has won gold medals in the 4 × 400 metres relay with Russia in European competition in the junior (2007), under-23 (2009) and senior (2010) levels. She won the silver medal in the individual 400 m at the 2010 European Athletics Championships with a personal best run of 49.92 seconds. She won the relay gold at the 2011 Summer Universiade and won her first global level medal with a relay bronze at the 2012 IAAF World Indoor Championships.
Ustalova began 2013 with an indoor best 51.31 seconds to win the Russian indoor title.
|2007||European Junior Championships||Hengelo, Netherlands||2nd||400 m||52.92|
|1st||4 × 400 m relay||3:33.95|
|2009||European U23 Championships||Kaunas, Lithuania||1st||400 m||51.74|
|1st||4 × 400 m relay||3:27.59|
|2010||European Team Championships||Bergen, Norway||1st||400 m||51.79|
|1st||4 × 400 m relay||3:23.76|
|European Championships||Barcelona, Spain||2nd||400 m||49.92|
|1st||4 × 400 m relay||3:26.89|
|2011||Universiade||Shenzhen, China||1st||4 × 400 m relay||3:27.16|
|2012||World Indoor Championships||Istanbul, Turkey||3rd||4 × 400 m relay||3:29.55|
|2013||European Indoor Championships||Gothenburg, Sweden||5th (h)||400 m||52.23|
|Universiade||Kazan, Russia||1st||400 m||50.60|
|1st||4 × 400 m relay||3:26.61|
|2015||World Championships||Beijing, China||4th||4 × 400 m relay||3:24.84|
|Competing as Authorised Neutral Athlete|
|2018||European Championships||Berlin, Germany||27th (h)||400 m||53.37|
|2019||World Championships||Doha, Qatar||26th (h)||400 m||51.99|
- Dolgopolov, Nickolai & Orlov, Rostislav (2013-02-14). Ustalova and Shubenkov post world leads at Russian Indoor Championships. IAAF. Retrieved on 2013-02-28.
- Did not finish the semifinal.
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