2026 Oeiras Indoors

Country	Player	Rank1	Seed
GBR	Billy Harris	121	1
GBR	Jan Choinski	124	2
LTU	Vilius Gaubas	129	3
ITA	Francesco Passaro	140	4
POR	Henrique Rocha	158	5
ESP	Daniel Mérida	164	6
AUT	Jurij Rodionov	167	7
COL	Nicolás Mejía	169	8

• ¹ Rankings are as of 12 January 2026.^[1]

The following players received wildcards into the singles main draw:

• Gastão Elias
• Tiago Pereira
• Tiago Torres

The following player received entry into the singles main draw through the Next Gen Accelerator programme:

• Petr Brunclík

The following players received entry from the qualifying draw:

• Calvin Hemery
• Maks Kaśnikowski
• Stefan Kozlov
• Mark Lajal
• Henri Squire
• Denis Yevseyev

The following players received entry as lucky losers:

• Andrés Andrade
• Mikhail Kukushkin
• Tyler Zink

• Chris Rodesch def. Zsombor Piros 6–4, 4–6, 6–2.

• Cleeve Harper / David Stevenson def. Francisco Rocha / Tiago Torres 6–3, 3–6, [12–10].