Sebastian Fanselow (born 30 December 1991) is a German tennis player. He has a career high ATP singles ranking of world No. 273, achieved on 8 August 2022, and a doubles ranking of No. 358, achieved on 15 August 2022.[1]
He made his ATP main draw debut at the 2024 Lyon Open after entering the singles main draw as a lucky loser, losing to Yoshihito Nishioka in the first round.
| Result | W–L | Date | Tournament | Surface | Opponent | Score |
|---|---|---|---|---|---|---|
| Loss | 0–1 | May 2022 | Shymkent, Kazakhstan | Clay |  Emilio Nava
|
4–6, 6–7(3–7) |
| Result | W–L | Date | Tournament | Surface | Partner | Opponents | Score |
|---|---|---|---|---|---|---|---|
| Loss | 0–1 | May 2022 | Shymkent, Kazakhstan | Clay |  Kaichi Uchida
|
 Antoine Bellier  Gabriel Décamps
|
6–7(3–7), 3–6 |
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