See main article: 2021 Split Open.
Treat Huey and Nathaniel Lammons were the defending champions[1] but chose not to defend their title.
Andrey Golubev and Aleksandr Nedovyesov won the title after defeating Szymon Walków and Jan Zieliński 7–5, 6–7(5–7), [10–5] in the final.