Singles
2023 Heilbronner Neckarcup
Final
Champion	Matteo Arnaldi
Runner-up	Facundo Díaz Acosta
Score	7–6(7–4), 6–1
Events
Singles Doubles
← 2022 · Heilbronner Neckarcup · 2024 →

Daniel Altmaier was the defending champion^[1] but chose not to defend his title.

Matteo Arnaldi won the title after defeating Facundo Díaz Acosta 7–6^(7–4), 6–1 in the final.

	Semifinals							Final
		Facundo Díaz Acosta	7	6
	WC	Rudolf Molleker	5	3
									Facundo Díaz Acosta	64	1
								5	Matteo Arnaldi	77	6
		Pedro Martínez	64	5
	5	Matteo Arnaldi	77	7

	First round							Second round							Quarterfinals							Semifinals
	1	M Cecchinato	5	3
	Q	A Santillan	7	6				Q	A Santillan	6	3	6
		J Kovalík	3	6	77				J Kovalík	2	6	3
		M Marterer	6	2	65										Q	A Santillan	5	3
	LL	M Janvier	6	6												F Díaz Acosta	7	6
	Q	Lucas Gerch	4	3				LL	M Janvier	1	6	65
		F Díaz Acosta	6	61	6				F Díaz Acosta	6	3	77
	7	O Otte	4	77	1																		F Díaz Acosta	7	6
	3	DE Galán	6	77																		WC	R Molleker	5	3
	Alt	C İlkel	4	63				3	DE Galán	5	6	6
	Q	J Kym	62	3					F Meligeni Alves	7	0	2
		F Meligeni Alves	77	6											3	DE Galán	4	7	5
	Q	S Fanselow	4	77	1										WC	R Molleker	6	5	7
	WC	R Molleker	6	65	6			WC	R Molleker	7	6
	Alt	H Casanova	3	4				6	F Marozsán	5	4
	6	F Marozsán	6	6

	First round							Second round							Quarterfinals							Semifinals
	8	P Kotov	78	6
		A Pellegrino	66	2				8	P Kotov	6	6
	Q	MH Rehberg	2	4r				Alt	D Added	2	2
	Alt	D Added	6	5											8	P Kotov	4	6	63
	Q	H Squire	4	2												P Martínez	6	4	77
		P Martínez	6	6					P Martínez	2	6	6
		K Uchida	4	4				4/WC	D Thiem	6	3	1
	4/WC	D Thiem	6	6																			P Martínez	64	5
	5	M Arnaldi	7	6																		5	M Arnaldi	77	7
		N Gombos	5	3				5	M Arnaldi	2	6	6
		O Krutykh	4	4				WC	M Topo	6	3	1
	WC	M Topo	6	6											5	M Arnaldi	1	6	7
		D Džumhur	5	1											2	J Munar	6	4	5
		T Skatov	7	6					T Skatov	2	5
		H Dellien	1	1				2	J Munar	6	7
	2	J Munar	6	6

• Main draw
• Qualifying draw