[3] After spending some time in Latvia,[5] Marsak went to Finland in June 2022 for a training camp led by Alina Mayer-Virtanen.

[2] In response to an appeal from the Ukrainian Figure Skating Federation, she and her husband, Valtter Virtanen, decided to help Marsak prepare for the season.

His first senior international medals, both bronze, came the following month, at the Volvo Open Cup in Latvia and the Tallinn Trophy in Estonia.

[3] In January, Ukraine named Marsak to replace the injured Ivan Shmuratko at the 2023 European Championships in Espoo, Finland.

[8] He went on to compete at the 2023 World Junior Championships in Calgary, Alberta, where he finished fifteenth, scoring personal bests in the free skate and combined total segments of the competition.

[3] Marsak began the season with a Junior Grand Prix appearance, coming fourteenth at the 2023 JGP Turkey.