He made his ATP Tour main-draw debut at the 2021 Stockholm Open as a wildcard, where he lost in the first round to eventual champion Tommy Paul.

[6] On September 11, 2022 he made his first professional final on the ITF Tour in Cairo, Egypt, after which his ATP ranking jumped to No.

[8] On October 30, Borg won his first professional title on the ITF Tour in Sharm El Sheikh, Egypt.

[10] In July, Borg received a wildcard at the Båstad Open, where he won his first match at ATP Tour level by defeating fellow Swede Elias Ymer in the first round, in straight sets.

Borg was given a wildcard entry into the Swedish Open in Båstad in July where he played Rafael Nadal in the first round, losing 6–3, 6–4.