2023 Sparkassen ATP Challenger

Country	Player	Rank1	Seed
JOR	Abdullah Shelbayh	212	1
BEL	Gauthier Onclin	214	2
ITA	Federico Gaio	217	3
ITA	Francesco Maestrelli	218	4
EST	Mark Lajal	229	5
ESP	Alejandro Moro Cañas	233	6
ITA	Stefano Napolitano	239	7
UKR	Illya Marchenko	248	8

• ¹ Rankings are as of 16 October 2023.^[3]

The following players received wildcards into the singles main draw:

• Lorenzo Carboni
• Francesco Forti
• Lorenzo Rottoli

The following players received entry into the singles main draw as alternates:

• Enrico Dalla Valle
• Andrew Paulson

The following players received entry from the qualifying draw:

• Hynek Bartoň
• Mirza Bašić
• Luca Giacomini
• Daniil Glinka
• Lukáš Klein
• Ryan Nijboer

• Lukáš Klein def. Maks Kaśnikowski 6–7^(4–7), 7–6^(7–4), 7–6^(8–6).

• Andrew Paulson / Patrik Rikl def. Maximilian Neuchrist / Jakub Paul 4–6, 7–6^(9–7), [11–9].