Anna Sidorova (Sochi, RUS) lost 8-3 to Alina Kovaleva (Saint-Petersburg, RUS) in the Final of the Russian Women's Curling Championship, held December 11 - 17, 2020 in Sochi, Russia. To advance to the championship game, Sidorova won 9-1 over Olga Kotelnikova (Dmitrov, RUS) in the semifinals of the 2021 Russian Women's Curling Championship in Sochi, Russia;
 
Sidorova finished 8-1 in the 0-team qualifying round. . In their opening game, Sidorova defeated Irina Nizovtseva (St. Petersburg, RUS) 9-5, then won 6-4 against Anastasia Babarykina (St. Petersburg, RUS) and 7-3 against Elizaveta Trukhina (Irkutsk, RUS). Sidorova won 9-1 against Kotelnikova, then won 7-4 against Evgenia Mamykina (Moscow, RUS) and 11-2 against Margarita Evdokimova (St. Petersburg, RUS). Sidorova went on to lose 7-6 against Vlada Rumiantseva (Dmitrov, RUS). Sidorova responded with a 6-3 win over Alina Biktimirova (Moscow, RUS). Sidorova won 7-5 against Kovaleva in their final qualifying round match.
 
Sidorova ranks 126th overall on the Year-to-Date rankings with 0.000 points earned so far this season.