Mozgov began skating in 1999. His parents introduced him to skating to improve his health. Early in his career, he competed with Sabina Adigamova. Mozgov and Evgenia Kosigina made their international debut in the 2008–09 season. The following season, they received a Junior Grand Prix assignment in Hungary, where they placed fifth. He ended their partnership after they finished 12th at the 2010 Russian Junior Championships. In the 2010–11 season, Mozgov competed with Tatiana Baturintseva. They received no JGP assignments and parted ways after placing 9th at the 2011 Russian Junior Championships.
Partnership with Yanovskaya
Mozgov teamed up with Anna Yanovskaya in 2011. They were coached mainly by Svetlana Alexeeva at the Medvedkovo rink in Moscow.
In 2012–13, Yanovskaya/Mozgov won a pair of silver medals at JGP events in Austria and Slovenia and qualified for the JGP Final in Sochi, Russia, where they finished fourth. They won the bronze medal at the 2013 Russian Junior Championships.
Yanovskaya/Mozgov decided to remain in the junior ranks in the 2014–15 season. In addition to Moscow, they also trained in Liepājain the summer. Mozgov recovered from a knee injury early in the season. In the 2014–15 JGP series, the duo won gold medals in Estonia and Croatia, earning qualification to their fourth JGP Final. At the event, held in December in Barcelona, they outscored Alla Loboda / Pavel Drozd for the gold and stood atop the podium for the second consecutive year. In March, they competed at the 2016 World Junior Championships in Tallinn, Estonia. Ranked first in both segments, they were awarded the gold medal ahead of Lorraine McNamara / Quinn Carpenter.
2015–16 season: Senior debut and split
Although still age-eligible for junior events in the 2015–16 season, Yanovskaya/Mozgov decided to move up to the senior ranks. Debuting on the Grand Prix, they placed sixth at the 2015 Skate America and 2015 Trophée Éric Bompard. In December, they finished sixth at the 2016 Russian Championships in Yekaterinburg. On 2 May 2016, the Russian media reported that their partnership had ended.
Partnership with Popova
According to the Russian media, Mozgov has teamed up with Betina Popova. Popova/Mozgov made their international debut at the 2016 CS Golden Spin of Zagreb where they placed fifth.
Popova/Mozgov took time off to heal injuries following their Universiade victory, and then resumed training for the new season. The two selected "Bohemian Rhapsody" as their free dance music, believing it would be a new sort of material for them. They placed fourth at the 2019 CS Ondrej Nepela Memorial and then won the bronze medal at the 2019 CS Finlandia Trophy. Given one Grand Prix assignment, they placed eighth at the 2019 Skate Canada International. Popova/Mozgov announced their retirement from competition in February 2020. Mozgov indicated that he might seek a coaching career.
Programs
With Popova
With Yanovskaya
Competitive highlights
GP: Grand Prix; CS: Challenger Series; JGP: Junior Grand Prix
With Popova
With Yanovskaya
With Baturintseva
With Kosigina
Detailed results
Small medals for short and free programs awarded only at ISU Championships. At team events, medals awarded for team results only.