2023 Oeiras Indoors – Singles

This was the first edition of the tournament.^[1]

Singles
2023 Oeiras Indoors
Champion	Joris De Loore
Runner-up	Filip Cristian Jianu
Score	6–3, 6–2

Main article: 2023 Oeiras Indoors

Joris De Loore won the title after defeating Filip Cristian Jianu 6–3, 6–2 in the final.

Seeds

1. Ričardas Berankis (second round)
2. Jay Clarke (second round)
3. Matteo Gigante (second round)
4. Hamad Međedović (second round)
5. Aziz Dougaz (first round)
6. Maximilian Neuchrist (quarterfinals)
7. Máté Valkusz (first round)
8. Raphaël Collignon (semifinals)

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
	Q	Cem İlkel	4	6	67
	Q	Joris De Loore	6	3	79
								Q	Joris De Loore	6	6
									Filip Cristian Jianu	3	2
		Filip Cristian Jianu	6	6
	8	Raphaël Collignon	3	2

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	R Berankis	2	6	7
		GM Moroni	6	1	5			1	R Berankis	2	7	63
	Q	K de Schepper	6	2	4			Q	C İlkel	6	5	77
	Q	C İlkel	4	6	6										Q	C İlkel	6	6
		Elmar Ejupovic	6	7												G Debru	1	2
	WC	P Sousa	3	5					E Ejupovic	3	6	5
		G Debru	2	6	7				G Debru	6	4	7
	7	M Valkusz	6	1	5																	Q	C İlkel	4	6	67
	3	M Gigante	6	7																		Q	J De Loore	6	3	79
		C Tabur	3	5				3	M Gigante	6	1	3
	Q	D Prižmić	7	6				Q	D Prižmić	2	6	6
		P-H Herbert	5	1											Q	D Prižmić	4	3
	WC	G Oliveira	6	79											Q	J De Loore	6	6
		L Wessels	3	67				WC	G Oliveira	4	4
	Q	J De Loore	6	710				Q	J De Loore	6	6
	5	A Dougaz	2	68

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	M Neuchrist	7	77
		L Neumayer	5	63				6	M Neuchrist	6	79
		V Vacherot	6	4	1				J Domingues	3	67
		J Domingues	1	6	6										6	M Neuchrist	3	64
		FC Jianu	3	6	77											FC Jianu	6	77
	Q	M Lajal	6	3	65				FC Jianu	6	6
		Lucas Gerch	4	3				4	H Međedović	2	3
	4	H Međedović	6	6																			FC Jianu	6	6
	8	R Collignon	6	6																		8	R Collignon	3	2
	WC	J Faria	1	1				8	R Collignon	6	77
		L Giustino	6	3	6				L Giustino	2	65
		Pol Martín Tiffon	1	6	3										8	R Collignon	6	7
	LL	E Leshem	6	6											LL	E Leshem	4	5
	Q	A Kachmazov	4	4				LL	E Leshem	3	6	6
		G Décamps	64	1				2	J Clarke	6	3	2
	2	J Clarke	77	6