See main article: 2021 Lisboa Belém Open.
Jaume Munar was the defending champion[1] but chose not to defend his title.
Dmitry Popko won the title after defeating Andrea Pellegrino 6–2, 6–4 in the final.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "2021 Lisboa Belém Open – Men's singles".
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