Leo Karl Borg (born 15 May 2003) is a Swedish tennis player.
He has a career high ATP singles ranking of world No. 334, achieved on 11 September 2023.
He is the son of 11-time Grand Slam champion and former world number 1 Björn Borg.
Borg excelled on the ITF junior circuit, defeating world No. 1 junior Bruno Kuzuhara in the final of the Porto Alegre in Brazil, one of the top junior tournaments, in March 2021.
Borg also qualified for and played in the 2021 junior Grand Slams, including Wimbledon.
His junior ranking peaked at #12 in the world.
Borg received a number of wildcards in ATP Challenger events and ATP Tour qualifying and main events and competed regularly on the world ITF Tour.
He made his ATP main draw debut at the 2021 Stockholm Open as a wildcard, where he lost in the first round to eventual champion Tommy Paul.
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. 581.
Ranked No. 577 at the 2022 Stockholm Open as a wildcard, he met with world No. 31 Tommy Paul again in the first round, this time losing in three sets 7–5, 4–6, 1–6.
On October 30, Borg won his first professional title on the ITF tour in Sharm El Sheikh, Egypt.
Borg made the largest leap in the world tennis rankings of any professional player in the calendar year 2022, moving over 1,500 spots and ending the year at world no. 507.
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.
He also received a wildcard for the singles draw of the 2023 Stockholm Open in singles and doubles.
