Aleksandra Stoyarosova/Ivan Kazachkov (Novosibirsk, RUS) won 7-6 over Nina Polikarpova/Kamil Karimov (Irkutsk, RUS) in the Final of the Russian Mixed Doubles B-Division Championship, held January 21 - 25, 2021 in Sochi, Russia. To advance to the championship game, Stoyarosova/Kazachkov won 9-3 over Valeria Denisenko/Mikhail Vlasenko (Irkutsk, RUS) in the semifinals of the 2021 Russian Mixed Doubles B-Division Championship in Sochi, Russia; and won 9-3 over Larisa Simonova/Petr Triandafilidi (Vladivostock, RUS) in the quarterfinals. of the 2021 Russian Mixed Doubles B-Division Championship in Sochi, Russia;
 
Stoyarosova/Kazachkov finished 4-1 in the 0-team qualifying round. . In their opening game, Stoyarosova/Kazachkov defeated Olga Antonova/Sergey Varlamov (St. Petersburg, RUS) 7-4, then won 8-5 against Ekaterina Glebova/Artem Ruchkin (Sochi, RUS) and 10-2 against Anastasia Sushkova/Bodgan Shestopalov (Tatarstan, RUS). Stoyarosova/Kazachkov won 10-6 against Arina Rusina/Nikita Shekhirev (Moscow, RUS). Stoyarosova/Kazachkov went on to lose 6-5 against Polikarpova/Karimov in their final qualifying round match.
 
Stoyarosova/Kazachkov ranks th overall on the Year-to-Date rankings with points earned so far this season.