In the United States, she played for the Phoenix Mercury in the Women's National Basketball Association (WNBA).

At a height of 203 cm, she has been the sixth-tallest player in the league (along with Zheng Haixia and Lindsay Taylor).

Though in the Russian national team, she has been overtaken by Ekaterina Lisina in being the tallest member.

Stepanova was born in the village of Shpakovskoye (now the town of Mikhaylovsk, in Stavropol Krai of the former Russian Soviet Federative Socialist Republic of the Soviet Union, and grew up in Tosno, Leningrad Oblast.

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