Niina Petrõkina

Petrõkina began learning how to skate in 2008 at the age of four. She began competing internationally for Estonia during the 2012–13 season at the Chicks level before going on to compete as a basic and advanced novice. She made her international junior debut at the Haabersti Cup in October 2017.

Petrõkina made her Junior Grand Prix debut in November at the 2018 JGP Czech Republic where she finished 11th. She didn't receive a second JGP assignment that season. She earned the bronze medals in the junior women's events at the 2018 Volvo Open Cup and 2018 Tallinn Trophy before placing fourth at the 2019 Estonian Championships. She later went on the take the titles at four more junior internationals in the new year.

Petrõkina received two Junior Grand Prix assignments to open her season. Competing in Latvia, she placed sixth, and in Poland, tenth. She defended her junior title at the 2019 Tallinn Trophy and placed second at the 2019 Ice Star in the lead up to the 2020 Estonian Championships, where she won the silver medal behind Eva-Lotta Kiibus. In March 2020, Petrõkina competed at her first World Junior Championships but failed to advance to the free skate, placing 33rd.

After not competing during the 2020–21 season due to a combination travel restrictions related to the COVID-19 pandemic and injury, Petrõkina opened her season at the second installment of the 2021 JGP France. She placed 7th at the event, and followed that performance up with a fourth place finish at the 2021 JGP Austria, a career best placement for her on the Junior Grand Prix circuit.

In November, Petrõkina made her senior international debut at her first Challenger Series event, the 2021 CS Cup of Austria, where she won the bronze medal behind Japanese skater Wakaba Higuchi, and South Korea's Park Yeon-jeong. She received a second Challenger assignment the following weekend, the 2021 CS Warsaw Cup, where she won the silver medal behind Russian competitor Maiia Khromykh and ahead of Ekaterina Kurakova of Poland. In December, Petrõkina won her first senior national title at the 2022 Estonian Championships over domestic rival Eva-Lotta Kiibus. Due to her result, she qualified as the top-seeded Estonian woman to one of two berths for her country at the 2022 European Championships.

After winning her national title, Petrõkina competed at a third Challenger assignment, the 2021 CS Golden Spin of Zagreb. She placed fourth in the short program, but advanced into bronze medal position by winning the free skate ahead of gold medalist Anastasiia Gubanova and silver medalist Amber Glenn.