2023 BOSS Open – Singles
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Frances Tiafoe defeated Jan-Lennard Struff in the final, 4–6, 7–6(7–1), 7–6(10–8) to win the singles title at the 2023 Stuttgart Open. It was his third ATP Tour title, and his first on grass courts (following titles on hardcourts and clay courts). Tiafoe saved a championship point en route to the title, in the final-set tiebreak. By winning the title, Tiafoe debuted in the top ten of the ATP rankings for the first time in his career.
Matteo Berrettini was the defending champion, but lost in the first round to Lorenzo Sonego.
Seeds
The top four seeds received a bye into the second round.
- Greece Stefanos Tsitsipas (second round)
- United States Taylor Fritz (quarterfinals)
- United States Frances Tiafoe (champion)
- Poland Hubert Hurkacz (semifinals)
- United States Tommy Paul (second round)
- Italy Lorenzo Musetti (quarterfinals)
- Italy Matteo Berrettini (first round)
- Australia Nick Kyrgios (first round)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted
Finals
| Semifinals | Final | ||||||||||||
| Germany Jan-Lennard Struff | 3 | 6 | 6 | ||||||||||
| 4 | Poland Hubert Hurkacz | 6 | 3 | 3 | |||||||||
| Germany Jan-Lennard Struff | 6 | 61 | 68 | ||||||||||
| 3 | United States Frances Tiafoe | 4 | 77 | 710 | |||||||||
| 3 | United States Frances Tiafoe | 6 | 713 | ||||||||||
| Q | Hungary Márton Fucsovics | 3 | 611 |
Top half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1/WC | Greece S Tsitsipas | 68 | 6 | 5 | |||||||||||||||||||||||
| France R Gasquet | 77 | 6 | France R Gasquet | 710 | 2 | 7 | |||||||||||||||||||||
| Q | United States C Eubanks | 62 | 4 | France R Gasquet | 4 | 5 | |||||||||||||||||||||
| China Z Zhang | 1 | 4 | Germany J-L Struff | 6 | 7 | ||||||||||||||||||||||
| Germany J-L Struff | 6 | 6 | Germany J-L Struff | 77 | 77 | ||||||||||||||||||||||
| France B Bonzi | 3 | 4 | 5 | United States T Paul | 64 | 65 | |||||||||||||||||||||
| 5 | United States T Paul | 6 | 6 | Germany J-L Struff | 3 | 6 | 6 | ||||||||||||||||||||
| 4 | Poland H Hurkacz | 6 | 3 | 3 | |||||||||||||||||||||||
| 4 | Poland H Hurkacz | 4 | 77 | 77 | |||||||||||||||||||||||
| WC | Spain F López | 65 | 3 | Q | Japan Y Watanuki | 6 | 65 | 65 | |||||||||||||||||||
| Q | Japan Y Watanuki | 77 | 6 | 4 | Poland H Hurkacz | 6 | 6 | ||||||||||||||||||||
| Australia C O'Connell | 6 | 6 | Australia C O'Connell | 4 | 4 | ||||||||||||||||||||||
| Germany D Altmaier | 3 | 1 | Australia C O'Connell | 77 | 6 | ||||||||||||||||||||||
| Italy L Sonego | 6 | 6 | Italy L Sonego | 65 | 3 | ||||||||||||||||||||||
| 7 | Italy M Berrettini | 1 | 2 |
Bottom half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | Italy L Musetti | 77 | 6 | ||||||||||||||||||||||||
| Q | Croatia B Gojo | 64 | 3 | 6 | Italy L Musetti | 6 | 6 | ||||||||||||||||||||
| France G Barrère | 6 | 6 | France G Barrère | 3 | 3 | ||||||||||||||||||||||
| WC | Germany O Otte | 4 | 3 | 6 | Italy L Musetti | 78 | 64 | 2 | |||||||||||||||||||
| United States M Giron | 6 | 3 | 4 | 3 | United States F Tiafoe | 66 | 77 | 6 | |||||||||||||||||||
| Czech Republic J Lehečka | 4 | 6 | 6 | Czech Republic J Lehečka | 62 | 4 | |||||||||||||||||||||
| 3 | United States F Tiafoe | 77 | 6 | ||||||||||||||||||||||||
| 3 | United States F Tiafoe | 6 | 713 | ||||||||||||||||||||||||
| 8 | Australia N Kyrgios | 5 | 3 | Q | Hungary M Fucsovics | 3 | 611 | ||||||||||||||||||||
| China Y Wu | 7 | 6 | China Y Wu | 4 | 6 | 4 | |||||||||||||||||||||
| Canada D Shapovalov | 6 | 3 | 4 | Q | Hungary M Fucsovics | 6 | 4 | 6 | |||||||||||||||||||
| Q | Hungary M Fucsovics | 3 | 6 | 6 | Q | Hungary M Fucsovics | 6 | 7 | |||||||||||||||||||
| France C Moutet | 60 | 710 | 5 | 2 | United States T Fritz | 4 | 5 | ||||||||||||||||||||
| A Karatsev | 77 | 68 | 7 | A Karatsev | 64 | 3 | |||||||||||||||||||||
| 2 | United States T Fritz | 77 | 6 |
Qualifying
Seeds
- United States Christopher Eubanks (qualified)
- Hungary Márton Fucsovics (qualified)
- Roman Safiullin (first round)
- Croatia Borna Gojo (qualified)
- Moldova Radu Albot (qualifying competition)
- Japan Yosuke Watanuki (qualified)
- Switzerland Antoine Bellier (qualifying competition)
- Turkey Altuğ Çelikbilek (qualifying competition)
Qualifiers
Qualifying draw
First qualifier
| First round | Qualifying competition | ||||||||||||
| 1 | United States Christopher Eubanks | 4 | 6 | 6 | |||||||||
| Alt | Zimbabwe Benjamin Lock | 6 | 4 | 2 | |||||||||
| 1 | United States Christopher Eubanks | 77 | 77 | ||||||||||
| 5 | Moldova Radu Albot | 65 | 63 | ||||||||||
| Alt | France Hugo Gaston | 2 | 0 | ||||||||||
| 5 | Moldova Radu Albot | 6 | 6 |
Second qualifier
| First round | Qualifying competition | ||||||||||||
| 2 | Hungary Márton Fucsovics | 6 | 6 | ||||||||||
| Germany Louis Wessels | 3 | 1 | |||||||||||
| 2 | Hungary Márton Fucsovics | 6 | 6 | ||||||||||
| 8 | Turkey Altuğ Çelikbilek | 4 | 4 | ||||||||||
| Alt | Germany Max Hans Rehberg | 1 | 4 | ||||||||||
| 8 | Turkey Altuğ Çelikbilek | 6 | 6 |
Third qualifier
| First round | Qualifying competition | ||||||||||||
| 3 | Roman Safiullin | 65 | 4 | ||||||||||
| Lebanon Benjamin Hassan | 77 | 6 | |||||||||||
| Lebanon Benjamin Hassan | 5 | 4 | |||||||||||
| 6 | Japan Yosuke Watanuki | 7 | 6 | ||||||||||
| Germany Henri Squire | 6 | 5 | 3 | ||||||||||
| 6 | Japan Yosuke Watanuki | 4 | 7 | 6 |
Fourth qualifier
| First round | Qualifying competition | ||||||||||||
| 4 | Croatia Borna Gojo | 64 | 6 | 6 | |||||||||
| Alt | Germany Mats Rosenkranz | 77 | 4 | 4 | |||||||||
| 4 | Croatia Borna Gojo | 5 | 77 | 6 | |||||||||
| 7 | Switzerland Antoine Bellier | 7 | 62 | 4 | |||||||||
| Ukraine Vladyslav Orlov | 3 | 4 | |||||||||||
| 7 | Switzerland Antoine Bellier | 6 | 6 |